How many X ways can you group 3 people from 4 sets of twins if no two people from the same set of twins can be chosen?
Options: A) 3 B) 16 C) 28 D) 32 E) 56

Rationale: ways to select 3 people from 8 people ( 4 twins x 2 ) = 8 c 3 = 56 ways to select 1 twin + 1 people = 4 c 1 * 6 c 1 = 24 ways to select a group 3 people from 4 sets of twins if no two people from the same set of twins can be chosen x = 56 - 24 = 32 ans : d
Answer: D