Question

Dev has joined Snapchat and has 20 friends and each of these friends has 40 friends. Later, it is found that at least two of his friends know each other and on marriage, he wants to invite all his friends and all the friends of his friends. Find the difference between minimum number of invitations sent by Dev and the maximum number of invitations sent by Dev.

A 760
B 758
C 765
D 755
E 770
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