Question

The number of ways a person can contribute to a fund out of 1 ten-rupee note , 1 five - rupee note , 1 two-rupee note and 1 one rupee note is

Answer 1

15 ways a person can contribute.

Explanation:

With all the 4 notes, (4C4=1 combinations)

10+5+2+1 =18

With any three of the notes, (4C3=4 combinations)

10+5+2 =17

10+5+1 =16

10+2+1 =13

5+2+1 =8

With any two of the notes, (4C2=6 combinations)

10+5 =15

10+2 =12

10+1 =11

5+2 =7

5+1 =6

2+1 =3

With any one of the notes, (4C1=4 combinations)

10

5

2

1

Therefore, he can contribute the following amounts to the fund.

18, 17, 16, 13, 8, 15, 12, 11, 7, 6, 3, 10, 5, 2, 1

So toal in 15 ways.

Answer 2

the person have 15 different ways to contribute to a fund