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There are 40 students in a class. A student is allowed to shake hand only once with a student who is taller than him or equal in height to him. He can’t shake hand with anyone who is shorter than him. Average height of the class is 5 feet. What is the difference between the maximum and minimum number of handshakes that can take place in the class?
(2015)
  • a)
  • b)
    361
  • c)
    40C2 - 40
  • d)
    40C2
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
There are 40 students in a class. A student is allowed to shake hand o...
If all are of equal height. number of handshakes = 40C2.
If all are of different heights, number of handshakes = 0
∴ Required difference = 40C2 – 0 = 40C2.
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Most Upvoted Answer
There are 40 students in a class. A student is allowed to shake hand o...
If all are of equal height. number of handshakes = 40C2.
If all are of different heights, number of handshakes = 0
∴ Required difference = 40C2 – 0 = 40C2.
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Directions: In a school, for class 10th the sections are allotted on the basis of the scores of the student in class 9th. There are four sections in class 9th namely A, B, C, D. A student obtaining highest marks will be allotted section P in class 10th. On the similar basis sections Q, R, S are allotted. P is the best section, Q, R and S are the 2nd, 3rd and 4th best section respectively.A record of score of 10 students were kept.Each year the lowest and highest score increases by 1.Each student got distinct marks as per record of January, 2011, the minimum marks is 20 and the maximum marks is 29. The sections were to be continued for 1 year in class 10th. Different sets of number of students are there in class 9th for any two year. In class 10th, section P has 4 students and, Q, R, S have 2 students each.The below table gives the number of students in each section of class 9th over the years:Q. Total number of students from section C moved in section Q in the year 2011 is what was the highest marks obtained by the student of section B in the year 2013?

Directions: In a school, for class 10th the sections are allotted on the basis of the scores of the student in class 9th. There are four sections in class 9th namely A, B, C, D. A student obtaining highest marks will be allotted section P in class 10th. On the similar basis sections Q, R, S are allotted. P is the best section, Q, R and S are the 2nd, 3rd and 4th best section respectively.A record of score of 10 students were kept.Each year the lowest and highest score increases by 1.Each student got distinct marks as per record of January, 2011, the minimum marks is 20 and the maximum marks is 29. The sections were to be continued for 1 year in class 10th. Different sets of number of students are there in class 9th for any two year. In class 10th, section P has 4 students and, Q, R, S have 2 students each.The below table gives the number of students in each section of class 9th over the years:Q. What was the highest marks obtained by the student of section B in the year 2013?

Directions: In a school, for class 10th the sections are allotted on the basis of the scores of the student in class 9th. There are four sections in class 9th namely A, B, C, D. A student obtaining highest marks will be allotted section P in class 10th. On the similar basis sections Q, R, S are allotted. P is the best section, Q, R and S are the 2nd, 3rd and 4th best section respectively.A record of score of 10 students were kept.Each year the lowest and highest score increases by 1.Each student got distinct marks as per record of January, 2011, the minimum marks is 20 and the maximum marks is 29. The sections were to be continued for 1 year in class 10th. Different sets of number of students are there in class 9th for any two year. In class 10th, section P has 4 students and, Q, R, S have 2 students each.The below table gives the number of students in each section of class 9th over the years:Q. Students of how many sections showed a consistent increase in marks obtained?

Directions : In a school, for class 10th the sections are allotted on the basis of the scores of the student in class 9th. There are four sections in class 9th namely A, B, C, D. A student obtaining highest marks will be allotted section P in class 10th. On the similar basis sections Q, R, S are allotted. P is the best section, Q, R and S are the 2nd, 3rd and 4th best section respectively.A record of score of 10 students were kept.Each year the lowest and highest score increases by 1.Each student got distinct marks as per record of January, 2011, the minimum marks is 20 and the maximum marks is 29. The sections were to be continued for 1 year in class 10th. Different sets of number of students are there in class 9th for any two year. In class 10th, section P has 4 students and, Q, R, S have 2 students each.The below table gives the number of students in each section of class 9th over the years:Q. The top scorer was present in which section in 2013?

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There are 40 students in a class. A student is allowed to shake hand only once with a student who is taller than him or equal in height to him. He can’t shake hand with anyone who is shorter than him. Average height of the class is 5 feet. What is the difference between the maximum and minimum number of handshakes that can take place in the class?(2015)a)b)361c)40C2 - 40d)40C2Correct answer is option 'D'. Can you explain this answer?
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