Multiple choice general knowledge math & puzzles

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)?

  1. 16

  2. 15

  3. 12

  4. 11

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The number of ways to choose one or more coins from 4 distinct coins is 2^n - 1. Here, n = 4, so 2^4 - 1 = 16 - 1 = 15. Each unique combination of denominations forms a different sum of money.