Selected MCQ

Current Question
In a group of 30 people, if everyone shakes hands once, how many handshakes?
  • A. 870
  • B. 435
  • C. 30!
  • D. 29! +1
Correct Answer: B
Explanation:
n(n−1)/2.
Related Question 1
In how many ways can 5 men and 2 women be selected from 7 people?
  • A. 63
  • B. 90
  • C. 126
  • D. 45
Correct Answer: A
Explanation:
Total ways = 2⁷ − 1 combinations adjusted → 63.
Related Question 2
12 people draw lots. Probability that one specific host has dinner is ____.
  • A. One
  • B. Zero
  • C. Three
  • D. Cannot be
Correct Answer: D
Explanation:
Insufficient clarity.
Related Question 3
12 inches equals how many centimeters?
  • A. 30.48
  • B. 29
  • C. 34.12
  • D. 24
Correct Answer: A
Explanation:
1 inch = 2.54 cm.
Related Question 4
A sum becomes triple in 3 years at compound interest. In how many years will it become 9 times?
  • A. 18
  • B. 12
  • C. 9
  • D. 6
Correct Answer: D
Explanation:
Growth is exponential → 6 years.
Related Question 5
A circular wheel of radius 1.75 m makes how many revolutions in 11 km?
  • A. 1000
  • B. 2000
  • C. 3000
  • D. 4000
Correct Answer: A
Explanation:
Revolutions = distance/circumference.