On the eve of Diwali festival, a group of 12 friends greeted every other friend by sending greeting cards. Find the number of cards purchased by the group.

Options

A. 156
B. 144
C. 132
D. 72

Answer

C

Explanation

There being 12 friends in the group, each friend must have purchased (12 - 1) i.e. 11 cards for sending greeting to rest of his 11 friends. Thus total number of cards purchased by all the friends together is 12 x 11 i.e. 132