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Find the remainder when 1661 + 1551 + ...

Find the remainder when
`1661 + 1551 + 1441 + 1331 + 1221` is divided by 20.

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Verified by Experts

The remainders when 1666,1551,1441,1331,1221 are divided by 20 are 1,11,1,11,1.So the requried remainder can be obtained just by dividing 1+11+1+11+1(=25) by 20. Hence the requried remainder is 5.
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