Multiple choice

There are 20 balls in a box out of which 4 are red, 9 are black and remaining are of some other colour. There is some probability of a red ball being selected in a random selection from the box. Which of the following actions will increase this probability?

  1. Put some more black balls in the box.

  2. Remove one red ball and 4 black balls from the box.

  3. Put one red ball and 4 black balls into the box.

  4. Remove some black balls from the box.

  5. Reduce some red balls from the box.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This will reduce the number of balls in the box but the number of red balls will remain same.

So, the probability of a red ball being selected will increase.

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