A person X has four notes of rupee 1, 2, 5 and 10 denomination. The number of different sums of money she can form from them is
A person X has four notes of Rupee 1,2,5 and 10 denomination.The number of different sums of money he can form from them is ---
a 16
b 15
c 12
d 8
(IAS-PRE-2010)