10 friends meet for movie 20 for picnic and 5 for games 4 for movie & picnic 2 for movie & games, 0 for picnic & games, 2 for all, how many are students are there in all?
Choose one.
A) 30 B) 31 C) 32 D) 33 E) 34
n(A U B U C)=n(A) + n(B) + n(C) - n(A INTERSECTION B) - n(A INTERSECTION C) - n(C INTERSECTION B) + n(A INTERSECTION B - INTERSECTION C)   Hence,   Total no. of Students = 10 + 20 + 5 - 4 - 0 - 2 + 2= 
<gadget id="calculator">10 + 20 + 5 - 4 - 0 - 2 + 2</gadget>
<output>31</output>
31.   ANSWER:31
<result>B</result>
10 friends meet for movie 20 for picnic and 5 for games 4 for movie & picnic 2 for movie & games, 0 for picnic & games, 2 for all, how many are students are there in all?