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question #1
7. 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

A
20 = 10 * 2
23 = 7 + 2(8)
29 = 7 * 3 + 8
.
20 = 10 * 2
23 = 7 + 2(8)
29 = 7 * 3 + 8

NET JUNE 2014 PAPER1