Selected MCQ

Current Question
The cube of a number is 27. What is the number?
  • A. 2
  • B. 3
  • C. 4
  • D. 5
Correct Answer: B
Explanation:
∛27 = 3.
Related Question 1
The sum of cubes of first 5 natural numbers is ____.
  • A. 100
  • B. 225
  • C. 125
  • D. 150
Correct Answer: B
Explanation:
(n(n+1)/2)² = 225.
Related Question 2
12 children take 16 days to finish work. Time for the same work with a different number is ____.
  • A. 3 days
  • B. 4 days
  • C. 6 days
  • D. 8 days
Correct Answer: C
Explanation:
Work is inversely proportional.
Related Question 3
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 4
Three flags of different coloRs. Number of signals using 1 or more flags is ____.
  • A. 6
  • B. 9
  • C. 15
  • D. 18
Correct Answer: C
Explanation:
Total combinations excluding empty = 2³ −1.
Related Question 5
Three dice are thrown. Find the number of outcomes where the sum is 10.
  • A. 36
  • B. 81
  • C. 91
  • D. 116
Correct Answer: C
Explanation:
Count valid combinations.