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Question

What is the largest number that divides 626,3127 and 15628 and leaves remainders of 1,2 and 3 respectively.

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Solution

Clearly, the required number is the HC.F of the numbers
6261=625,31272=3125 and 156283=15625.
Using Euclid's division lemma to find the H.C.F. of 625 and 3125.
3125=625 × 5+0
Clearly, H.C.F. of 625 and 3125 is 625.
Now, H.C.F. of 625 and 15625
15625=625 × 25+0
So, the H.C.F of 625 and 15625 is 625
Hence, H.C.F of 625,3125 and 15625 is 625.

Hence, the required number is 625.

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