# 9.8.1. Operations on Events

A set of identical cards numbered from 1 to 10 with no repetition were shuffled well. If a card is drawn at random, find the probability of the number on it being divisible by 4.

- A0.2
- B0.3
- C0.1
- D0

### Example

A set of identical cards numbered from 1 to 10 with no repetition were shuffled well. If a card is drawn at random, find the probability of the number on it being divisible by 4.

### Solution

The probability of event

Thus, the probability of drawing a card that is divisible by 4 is 0.2.