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Question
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 _____________.
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 _____________.
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Solution
The correct option is C 132
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.
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.
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