Multiple choice general knowledge math & puzzles

There are 30 red balls, 40 black balls & 60 white balls in a bag in a dark room. How many balls you have to take from the bag to ensure that you have atleast a ball of each colour with you.

  1. 99

  2. 60

  3. 101

  4. 30

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To ensure one of each, consider the worst-case scenario: you pick all 60 white balls and all 40 black balls first. At this point (100 balls), you still don't have a red ball. The 101st ball must be red. Thus, 101 balls ensure all colors.