Question

A group of 6 friends is thinking about a summer break trip to palawan. at least 4 of them should make an early booking to avail of the group discount flight. how many groups can be formed such that they day can avail of the discount?

Please help me :(​

Answer 1

Answer:

if all of them booked, 6C6 = 1, they could make 1 group. if only 5 people will book, 6C5 = 6, there can be 6 groups that can be made. if only 4 people will book, 6C4 = 15, there are 15 groups that can be made. If we add them all, 1+6+15= the answer is 22

Step-by-step explanation:

so the equation would be:

=6C6+ 6C5+6C4

= 1+6+15

=22 ways