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Sonu saini Best Answer
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why RHS of 1st equation is 1mod10 and not any other choice?
for last digit we take mod 10
because if we divide any term by 10 like 732/10 so we have 2 ...where 2 is last term
2 as a remainder
if you need last two digit so take mod 100....like 732/ 100 you have 32 ...these are the last two digit of our number