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The number of ways to select 2 numbers from {0,1,2,3,4}  such that the sum of the squares of the selected numbers is divisible by 5 are (repetition of digits is allowed)

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By Expert Faculty of Sri Chaitanya
a
9C1
b
9C8
c
9
d
7
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detailed solution

Correct option is C

Given digits 0, 1, 2, 3, 4

The possible numbers such that the sum of the squares is divisible by 5 are 00, 12, 13, 24, 42, 31, 21, 34, 43

Number of numbers =9(or)9C1(or)9C8


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