Quant Question Of The Day: 124
Counting
In how many ways can 3 integers be selected from the set {1,2,3,4,…….,37} such that the sum of the 3 integers is an odd number ?
A. 3,876
B. 7,638
C. 6,378
D. 1,938
There are 18 even and 19 odd numbers in the given set. For sum to be odd either all 3 numbers should be odd or 2 of them even and one odd.
This is possible in
19C3 + ( 18C2 × 19C1 ) = 3876 ways
See our previous ‘Questions of the Day’:
Quant Question Of The Day: 123
Quant Question Of The Day: 122
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