2023 · Q100
A dice is thrown two times. The number of ways that the number appearing on the first throw is not less than that on the second throw is:
General Mental Ability, Quantitative Aptitude and StatisticsNumber system and arithmetic
- A15
- B20
- C21
- D36
Explanation
The first throw must show a number greater than or equal to the second. For first throw = 1 there is 1 such outcome, for 2 there are 2, and so on up to 6 for first throw = 6. The total is 1 + 2 + 3 + 4 + 5 + 6 = 21 ways, option (c).