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Question

If 7103 is divided by 25, then the remainder is

A
20
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B
16
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C
18
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D
15
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Solution

The correct option is B 18
We have, 7103=7(49)51=7(501)51
=7(505151C15050+51C25049...1)
=7(505151C15050+51C25049...)7+1818
=7(505151C15050+51C25049...)25+18
=k+18 (say)
k is divisible by 25.
remainder is 18.

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