Question

In a purse there are 30 coins, twenty one-rupee and remaining 50-paise coins. Eleven coins are picked simultaneously at random and are placed in a box. If a coin is now picked from the box, find the probability of it being a rupee coin?
Option 1 : 4/7 Option 2 : 1/2 Option 3 : 2/3 Option 4 : 5/6

Answer 1

The solution to the answer is as follows:


0votesanswered Aug 8, 2015 by Shashi Kumar Evangelist (3,082 points)total coins 30
1 rupee coins 20
50 paise coins 10

1 rupee coin probability 20C11
11 coin are picked 30C11
ans should be = 20C11/30C11 = 2/3
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