Question

in a group of 11 persons, each shakes hand with every other once only once. what is the total number of such handshakes ?

Answer 1

A) 11 × 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
B) 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
C) 11 × 10
D) 55
E) 45

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Answer 2

Answer:

Step-by-step explanation:

In a group of 11 persons, each shakes hand with every other once only once. what is the total number of such handshakes ?