UGC NET Paper 1 GA 2014 June Solved Paper

A. 19 = 7 × 2 + 5 = 8 × 2 + 3 = 10 × 1 + 8 × 1 + 1 = 10 × 1 + 7 × 1 + 2
B. 20 = 10 × 2 = 20
C. 23 = 8 × 2 + 7 × 1 = 16 + 7 = 23
D. 29 = 7 × 3 + 8 × 1 = 21 + 8 = 29
Hence, the exact amount for which one can not buy stamps is 19.