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 most appropriate option:
A) 234  B) 255  C) 265  D) 270  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?