probability PLS HELP

[ahlashi]

Q1
5 non similar pair of gloves is in a closet. 4 gloves are drawn at random. what is the probablity that there will atleast be one complete pair among the 4 gloves

Q2
you have 6 close friends
how many ways you can invite one or more of them to your b'day party.

PLS HELP

[Amit Goyal]

For Q 1, refer: Link
For Q 2, the answer is 2^6 - 1

[Tania123]

For Q2, shouldn't it be 2^6-1? Excluding the case where no one is invited?

[Amit Goyal]

That's right.