1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days
8104911739

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

022-62211530

Mon to Sat - 11 AM to 8 PM

# 1. In how many ways can I invite one or more of friends to a dinner? 2.8 friends shake hands mutually.Find the total number of handshakes.For each shake hand we need two persons.

Asked by 13th March 2013, 9:26 PM
1) Your first question is incomplete. However, these types of questions can be solved in the following manner.
Suppose a person has 6 friends. And we need to find out the number of ways in which he can invite one or more of them at a dinner.

He may invite one or more friends by selecting either one, two three, four, five or six out of the 6 friends. So total number of ways = 6C1 + 6C2 + 6C3 + 6C4 + 6C5 + 6C6

Since there are 8 friends, and each handshake requires 2 friends, this is the same as choosing 2 people out of 8 people.
Thus, the answer will be 8C2 handshakes
Answered by Expert 14th March 2013, 3:57 PM
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10

You have rated this answer /10