A person has 4 coins each of different denomination. What is the number of different sums of money
A person has 4 coins each of different denomination. What is the number of different sums of money the person can form (using one or more coins at a time)?
(a) 16 (b) 15 (c) 12 (d) 11
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(b) No. of different sums of money = any 1 coin at a time + any 2 coins + any 3 coins it all 4 coins
= 4C1 + 4C2 + 4C3 + 4C4
= 4 + 6 + 4 + 1 = 15
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