In a friendship gang Andrew has 8 gang, in how many ways can he invite one or more of the gang to his house?	Select
A) 234 B) 255 C) 278 D) 289 E) 290
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?