John has 6 people in his group of friends. How many different ways can he invite one or more of them to his house?  Pick.
A) 56 B) 97 C) 63 D) 65 E) 71
John can select one or more of his group of 6   =&gt; Required number of ways = 2^6 – 1= 63.   63
<result>C</result>
John has 6 people in his group of friends. How many different ways can he invite one or more of them to his house?