JEE Main 2019 — Math solution | Fundamenthol

JEE Main2019Math

Q.

Let S = {1, 2, ...., 20}. A subset B of S is said to be “nice”, if the sum of the elements of B is 203. Then the probability that a randomly chosen subset of S is “nice” is

A
$\frac{7}{2 ^{20}}$
B
$\frac{6}{2 ^{20}}$
C
$\frac{4}{2 ^{20}}$
D
$\frac{5}{2 ^{20}}$

Solution

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