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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?
- a)1
- b)14
- c)20
- d)21
Correct answer is option 'C'. Can you explain this answer?
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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digi...
Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
Number of such number =14
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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digi...
Percentage of Numbers with 1 or 9 in the Unit's Digit
The numbers from 1 to 70 have 7 numbers each with 1 or 9 in the unit's digit, which are: 1, 9, 11, 19, 21, 29, and 31.
Total Numbers from 1 to 70
There are a total of 70 numbers from 1 to 70.
Numbers with 1 or 9 in the Unit's Digit
Out of the 70 numbers, there are 7 numbers with 1 or 9 in the unit's digit.
Calculating the Percentage
To find the percentage of numbers with 1 or 9 in the unit's digit, we use the formula:
Percentage = (Number of favorable outcomes / Total number of outcomes) x 100
Plugging in the Values
Number of favorable outcomes = 7 (numbers with 1 or 9 in the unit's digit)
Total number of outcomes = 70
Calculating the Percentage
Percentage = (7/70) x 100 = 0.20 x 100 = 20%
Therefore, the percentage of numbers from 1 to 70 that have 1 or 9 in the unit's digit is 20%. Hence, option C is the correct answer.
The numbers from 1 to 70 have 7 numbers each with 1 or 9 in the unit's digit, which are: 1, 9, 11, 19, 21, 29, and 31.
Total Numbers from 1 to 70
There are a total of 70 numbers from 1 to 70.
Numbers with 1 or 9 in the Unit's Digit
Out of the 70 numbers, there are 7 numbers with 1 or 9 in the unit's digit.
Calculating the Percentage
To find the percentage of numbers with 1 or 9 in the unit's digit, we use the formula:
Percentage = (Number of favorable outcomes / Total number of outcomes) x 100
Plugging in the Values
Number of favorable outcomes = 7 (numbers with 1 or 9 in the unit's digit)
Total number of outcomes = 70
Calculating the Percentage
Percentage = (7/70) x 100 = 0.20 x 100 = 20%
Therefore, the percentage of numbers from 1 to 70 that have 1 or 9 in the unit's digit is 20%. Hence, option C is the correct answer.
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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digi...
Total 14 no.s 14/70×100
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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?a)1b)14c)20d)21Correct answer is option 'C'. Can you explain this answer?
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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?a)1b)14c)20d)21Correct answer is option 'C'. Can you explain this answer? for Quant 2025 is part of Quant preparation. The Question and answers have been prepared according to the Quant exam syllabus. Information about What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?a)1b)14c)20d)21Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Quant 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?a)1b)14c)20d)21Correct answer is option 'C'. Can you explain this answer?.
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