Question

In a post-office, stamps of three different denominations of rs 7, rs 8, rs 10 are available. the exact amount for which one cannot buy stamps is

Answer 1

10 rs stamp we can't buy....due to comitions

Answer 2

Answer:

19

Step-by-step explanation:

Given : In a post-office, stamps of three different denominations of Rs. 7, Rs.8, Rs.10 are available.

To find : The exact amount for which one cannot buy stamps is (a) 19 (b) 20 (c) 23 (d) 29 ?

Solution :

We have 23 is possible by 8 + 8 + 7 = 23

               20 is possible by 10 + 10 =20

              29 is possible by 7 + 7 + 7 + 8 =29

Here only 19 is not possible for three different denominations.

Therefore, 19 is the answer.