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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Abhijeet Gaurav
Let's say he invites only 1 friend, that can be done in 6C1 = 6 If he invites only 2 friends, then 6C2 = 15 If he invites only 3 friends, then 6C3 = 20 If he invites only 4 friends, then 6C4 = 15 If he invites only 5 friends, then 6C5 = 6 If he invites all his friends, then 6C6 = 1 Summation of all will be your answer = 63. Hence Answer is (63).