A) 156
B) 144
C) 210
D) 320
Correct Answer: C
Solution :
There being 15 friends in the group, each friend must have purchased \[(15-1)\] i.e 14 cards for sending greeting to rest of his 14 friends. Thus total number of cards Purchased by all the friends together is \[15\times 14\] i.e. 210.
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