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Divya

· started a discussion

· 1 Months ago

This sum has 2 possibilty (Question:912592.0)

5c4 10c 1

Question:

A box contains 8 five rupees coins and 6 ten rupees coins. If 4 coins are picked at random. Find the probability that the sum of the coins is rupees 30.

Options:
A)

581001    

B)

641001    

C)

811001    

D)

431001    

E)

None of these

Solution:

Ans. (d)

Only one case is possible = 2 ten rupees notes and 2 five rupees notes.

Probability = Probability = [6C2 + 8C2] ÷ 14C4 = [15 + 28] ÷ 1001

=  43/1001

Knowledge Expert

· commented

· 1 Months ago

Given answer is correct
Probability = [6C2 + 8C2] ÷ 14C4 = [15 + 28] ÷ 1001
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