In a friendship gang Angel has 3 gang, in how many ways can he invite one or more of the gang to his house?
Answers:  A) 58  B) 5  C) 12  D) 9  E) 7
Angel can select one or more than one of his 8 gang.   =&gt; Required number of ways = 2^3 – 1= 7.   7
<result>E</result>
In a friendship gang Angel has 3 gang, in how many ways can he invite one or more of the gang to his house?