In a friendship gang Andrew has 8 gang, in how many ways can he invite one or more of the gang to his house?	Choose the correct answer:	A) 234	B) 255	C) 265	D) 267	E) 272
Andrew can select one or more than one of his 8 gang.   =&gt; Required number of ways = 28 – 1= 255.   255
<result>B</result>
In a friendship gang Andrew has 8 gang, in how many ways can he invite one or more of the gang to his house?