If x is an integer, is x! + (x + 1) a prime number?
1) x < 10
2) x is even
  • a)
    Exactly one of the statements can answer the question
  • b)
    Both statements are required to answer the question
  • c)
    Each statement can answer the question individually
  • d)
    More information is required as the information provided is insufficient to answer the question
Correct answer is option 'D'. Can you explain this answer?
Related Test: Test: Prime Numbers- 1

GMAT Question

Gautam Shinde
Oct 16, 2018
Stmt1 
x <10> x can be 2 so 2!+3 = 5 - prime 
But x can be 3 so 3!+4 = 10 - Non prime 
So InSuff 

Stmt2 
x is even. 

x can be 2 so 2!+3 = 5 - prime 
But x can be 14 so 14! + 15 is not prime 

Combine 1 and 2 you will see x! + x + 1 is prime

This discussion on If x is an integer, is x! + (x + 1) a prime number?1) x < 102) x is evena)Exactly one of the statements can answer the questionb)Both statements are required to answer the questionc)Each statement can answer the question individuallyd)More information is required as the information provided is insufficient to answer the questionCorrect answer is option 'D'. Can you explain this answer? is done on EduRev Study Group by GMAT Students. The Questions and Answers of If x is an integer, is x! + (x + 1) a prime number?1) x < 102) x is evena)Exactly one of the statements can answer the questionb)Both statements are required to answer the questionc)Each statement can answer the question individuallyd)More information is required as the information provided is insufficient to answer the questionCorrect answer is option 'D'. Can you explain this answer? are solved by group of students and teacher of GMAT, which is also the largest student community of GMAT. If the answer is not available please wait for a while and a community member will probably answer this soon. You can study other questions, MCQs, videos and tests for GMAT on EduRev and even discuss your questions like If x is an integer, is x! + (x + 1) a prime number?1) x < 102) x is evena)Exactly one of the statements can answer the questionb)Both statements are required to answer the questionc)Each statement can answer the question individuallyd)More information is required as the information provided is insufficient to answer the questionCorrect answer is option 'D'. Can you explain this answer? over here on EduRev! Apart from being the largest GMAT community, EduRev has the largest solved Question bank for GMAT.
This discussion on If x is an integer, is x! + (x + 1) a prime number?1) x < 102) x is evena)Exactly one of the statements can answer the questionb)Both statements are required to answer the questionc)Each statement can answer the question individuallyd)More information is required as the information provided is insufficient to answer the questionCorrect answer is option 'D'. Can you explain this answer? is done on EduRev Study Group by GMAT Students. The Questions and Answers of If x is an integer, is x! + (x + 1) a prime number?1) x < 102) x is evena)Exactly one of the statements can answer the questionb)Both statements are required to answer the questionc)Each statement can answer the question individuallyd)More information is required as the information provided is insufficient to answer the questionCorrect answer is option 'D'. Can you explain this answer? are solved by group of students and teacher of GMAT, which is also the largest student community of GMAT. If the answer is not available please wait for a while and a community member will probably answer this soon. You can study other questions, MCQs, videos and tests for GMAT on EduRev and even discuss your questions like If x is an integer, is x! + (x + 1) a prime number?1) x < 102) x is evena)Exactly one of the statements can answer the questionb)Both statements are required to answer the questionc)Each statement can answer the question individuallyd)More information is required as the information provided is insufficient to answer the questionCorrect answer is option 'D'. Can you explain this answer? over here on EduRev! Apart from being the largest GMAT community, EduRev has the largest solved Question bank for GMAT.