Integer Exercise 3

 Integer Review:    Fundamentals of Integers , Rules for Multiplication , Rules for divisibility,  Division Terminology,  Even & Odd Integer,  Rules about even & odd integer, Prime Number,  Prime Factorization ,  Distinct Prime Number,  LCM & HCF,  Composite Numbers ,  Consecutive Integers

Class Questions :   Exercise 1         Exercise 2         Exercise 3        Exercise 4      Exercise 5

Practice Questions :   Solutions  

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 GRE Integer Exercise 3

 Q.5   The result of an equation 28 – 5a is   always a prime number then which of the following value of ‘a’ will not justify the equation?

     A. 5

     B. 3

     C. 2

     D. 4

     E. 1

Solution;

By taking all the values individually this problem can be solved.

  1. 28 – 5 x 5 = 28 – 25 = 3, is a prime number.

  2. 28 – 5 x 3 = 28 – 15 = 13, is a prime number.

  3. 28 – 5 x 2 = 28 – 10 = 18, not a prime number.

  4. 28 – 5 x 4 = 28 – 20 = 8, not a prime number.

  5. 28 – 5 x 1 = 28 – 5 = 23, is a prime number.

The options A, B, and E are prime numbers but options C and D are not  prime numbers, so correct answer choice will be  ‘C’ and ‘D’.

Q.6

              Quantity A                                      Quantity B

                   1                                              Even and prime number

     A.  If Quantity A is greater

     B.   If Quantity B is greater

     C.   If Quantity A and Quantity B are equal

      D. The relationship cannot be determined from given information

Solution;

As there is only one even and prime number which is ‘2’

So, if we compare the value of Quantity A = 1 and value of Quantity B = 2

Quantity B will be greater, hence correct answer choice is ‘B’.

                                                     

 Integer Review:    Fundamentals of Integers , Rules for Multiplication , Rules for divisibility,  Division Terminology,  Even & Odd Integer,  Rules about even & odd integer, Prime Number,  Prime Factorization ,  Distinct Prime Number,  LCM & HCF,  Composite Numbers ,  Consecutive Integers

Class Questions :   Exercise 1         Exercise 2         Exercise 3        Exercise 4      Exercise 5

Practice Questions :   Solutions  

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