CSAT 2020 | DDSQ May 1 | Civil Services | IAS | UPSC | State PSC | SSC | IBPS | NDA | CDS | Railways

In a society it is customary for the friends of same sex to hug and friends of opposite sex to shake hands when they meet. A group of friends met in a party and there are 24 handshakes. Which one among the following numbers indicates the possible number of hugs?

(a) 39
(b) 30
(c) 21
(d) 20