Question

A bag contains 20 cards numbered from 1,2,3.........20.if four cards are drawn are random ,what is the probability that the numbers on the card are in ap?

Answer 1

We have,

Total no. of cards 20

Given:- 4 cards are drawn randomly

So P(e)= 4/20= 1/5

Note:- This series of no.s are already arranged in AP.

I hope this will help you...