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Past CAT Remainder Questions

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So here are few variety of questions on Past CAT Remainder Questions, discussed in group along with detailed solutions.

1.What is the remainder when 4^96 is divided by 6?

1) 0
2) 2
3) 3
4) 4

Remark: It can be done in 3 different ways, iQuanta shortcut, or Euler or Chinese remainder Theorem

Solution here: https://www.facebook.com/groups/Rockthecat/permalink/951506845017018/

2. The remainder, when (15^23 + 23^23) is divided by 19, is:

1) 4
2) 15
3) 0
4) 18

Remark : It uses 

Solution here : https://www.facebook.com/groups/Rockthecat/permalink/951508841683485/

3. If x = (16^3 + 17^3 + 18^3 + 19^3), then x divided by 70 leaves a remainder of

1) 0
2) 1
3) 69
4) 35

Remark : It uses concept of previous questions, but it has 1 extra condition to remember.

Solution here: https://www.facebook.com/groups/Rockthecat/permalink/951512195016483/

4. Let n! = 1 × 2 × 3 × … × n for integer n ≥ 1. If p = 1! + (2 × 2!) + (3 × 3!) + … +(10 × 10!), then p + 2 when divided by 11! leaves a remainder of

1) 10
2) 0
3) 7
4) 1

Remark : It has 2 ways : One by general expanding and other is a generalised shortcut, both discussed in the link below

Solution here: https://www.facebook.com/groups/Rockthecat/permalink/951515988349437/

5. Let N = 1421 × 1423 × 1425. What is the remainder when N is divided by 12?

1) 0
2) 9
3) 3
4) 6

Remark : It is one of the easiest questions on remainder asked in CAT.

Solution here:https://www.facebook.com/groups/Rockthecat/permalink/951524618348574/

6. The integers 34041 and 32506 when divided by a three-digit integer ‘n’ leave the same remainder. What is ‘n’?

Remark : It is a very conceptual question and tricky one if one doesn’t know the solution already.

Solution here : https://www.facebook.com/groups/Rockthecat/permalink/951530165014686/

7. On dividing a number by 3, 4 and 7, the remainders are 2, 1 and 4 respectively. If the same number is divided by 84 then the remainder is

1) 80
2) 76
3) 53
4) None of these

Remark : A question on Chinese remainder theorem

Solution here: https://www.facebook.com/groups/Rockthecat/permalink/951535571680812/

8. For all integers n > 0, 7^6n – 6^6n is divisible by

1) 13
2) 127
3) 559
4) All of these

Remark: An application of algebraic formula a^2-b^2=(a-b)(a+b)

Solution here: https://www.facebook.com/groups/Rockthecat/permalink/951542481680121/

9. The remainder when 2^256 is divided by 17 is

1) 7
2) 13
3) 11
4) 1

Remark : A simple question on Euler theorem

Solution here: https://www.facebook.com/groups/Rockthecat/permalink/951547285012974/

10. 101! Mod 103 [ CAT 2003]

Remark : A simple question on Wilson Theorem

Solution here : https://www.facebook.com/groups/Rockthecat/permalink/951554621678907/

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