In a friendship gang Mala has 5 gang, in how many ways can he invite one or more of the gang to his house?	Choose the most appropriate option.
A) 31	B) 12	C) 58	D) 74	E) 36
mala can select one or more than one of his 8 gang.   =&gt; Required number of ways = 2^5 – 1= 31.   31
<result>A</result>
In a friendship gang Mala has 5 gang, in how many ways can he invite one or more of the gang to his house?