Question

MEDAL AND FAN

Cards with the numbers 1 through 40 are placed in a box and thoroughly shuffled.


What is the probability of randomly selecting a card with a number less than 10 or a multiple of 15?

Answer 1

@AriPotta

Answer 2

B?

Answer 3

With 40 cards, each card has a 2.5% chance of being picked (1÷40×100).

There are 9 numbers worth less than ten, so there is a 22.5% chance of a number under ten being picked (2.5×9=22.5).

There are 2 multiples of 15 worth less than 40 (15, and 30) so there is a 5% chance a multiple of 15 will be picked (2.5×2=5)