A 'Happy Journey!' greeting was exchanged exactly once between two good friends. How many 'Happy Journey!' greetings were exchanged among eight good friends?
(a) 32
(b) 42
(c) 38
(d) 28
A 'Happy Journey!' greeting was exchanged exactly once between two good friends. How many 'Happy Journey!' greetings were exchanged among eight good friends?
(a) 32
(b) 42
(c) 38
(d) 28