Q.

Let x and y be distinct integers where 1≤x25and1y25  . Then, the number of ways of choosing x and y, such that x + y is divisible by 5, is ……. 

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answer is 120.

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Detailed Solution

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TypeNumbers5k5,10,15,20,255k+11,6,11,16,215k+22,7,12,17,225k+33,8,13,18,235k+44,9,14,19,24
(a, b)canbeselectedas
(I)1of(5k+1)and1of(5k+4)=2×25=50
(II)1of(5k+2)and1of(5k+3)=2×25=50
(III)bothofthetype5k=20
Total=120

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