There is 7 friends (A1, A2, A3....A7).If A1 have to have shake with all without repeat. How many handshakes possible?
Choose the most appropriate option
A) 6	B) 21	C) 28	D) 7	E) 9
only A1 have to hand shake,so A1 can hand shake with remaining 6 person.   6NSWER:6
<result>A</result>
There is 7 friends (A1, A2, A3....A7).If A1 have to have shake with all without repeat. How many handshakes possible?