7.
from above diagram we see :
A + B + C - n(exactly 2) + n(all 3) + n(none) = 100
50 + 40+ 30 - n(exactly 2) + 5 + 10 = 100
n(exactly 2) = 135-100 = 35
ANSWER : 35 support exactly 2 bills
(please upvote)
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