Gate Exam Numerical Ability Permutation and Combination

There are 254 women. A sales man asks each about which product they
use out of three
(A, B, C,) 22 use all three, 39 use B and C....... Each uses atleast one
product.
Find the number of women that use product C

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Gate Other Question

form differential eq of following function

y=(ae^x)+(be^-x)+c
profit & loss