1.

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 :(1)  4/220(2)  7/220(3)   5/220(4)  6/220

Answer»

Correct option  (3)  5/220

Explanation:

Sum of all number of set S = 210.

We have to find numbers whose sum is 203.

So basically we have to remove 7.

7 can be obtained as 7

1, 6

2, 5

3, 4

1, 2, 4 

Total = 5

Samples space = 220 

So   5/220



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