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 choice.
A) 230	B) 255	C) 259	D) 265	E) 270
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?