Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CISF2025
If for some positive integer k, 5^43 + 5^k is divisible by 7, then which one of the following could be the value of k ?
- A 42
- B 44
- C 46 ✓
- D 48
✓ Correct answer: (C)
Quantitative Aptitude › Number System
CISF2023
What is the smallest number, which when multiplied by 9 gives the product having the digit 5 only in all places?
- A 95283955
- B 61728395 ✓
- C 12345675
- D 59382716
✓ Correct answer: (B)
Quantitative Aptitude › Number System
EPFO2020
How many times does the digit 3 appear between 1 and 100 such that the number where 3 appears is not divisible by 3 ?
- A 11
- B 12 ✓
- C 13
- D 17
✓ Correct answer: (B)
Quantitative Aptitude › Number System
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