Selected MCQ

Current Question
The smallest prime number ____.
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Correct Answer: C
Explanation:
2 is the smallest prime.
Related Question 1
Four prime numbers in ascending order have the smallest difference. Find the smallest.
  • A. 5
  • B. 7
  • C. 11
  • D. 13
Correct Answer: A
Explanation:
The closest primes start at 5.
Related Question 2
Three numbers are co-prime. The product of the first two is 551. Find the third.
  • A. 75
  • B. 81
  • C. 85
  • D. 89
Correct Answer: C
Explanation:
Factorization approach.
Related Question 3
Four prime numbers in ascending order, given the condition. Find the second number.
  • A. 17
  • B. 29
  • C. 23
  • D. 31
Correct Answer: B
Explanation:
Based on the given pattern.
Related Question 4
The smallest number which when divided by 20, 25, 35 and 40 leaves remainder 9 is ____.
  • A. 1994
  • B. 1494
  • C. 1349
  • D. 1496
Correct Answer: C
Explanation:
LCM + remainder answers.
Related Question 5
The smallest number which when increased by 1 is divisible by 12, 18, 24 and 32 is ____.
  • A. 1439
  • B. 1440
  • C. 1459
  • D. 1449
Correct Answer: A
Explanation:
LCM − 1 = required number.