How many ordered pairs of integers (a, b) are there such that 100 ≤ a, b ≤ 200 and no carrying is required when calculating a+b?
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let a be of form 1MN and b of form 1PQ where 0≤M,N,P,Q≤9
SO if there is no carry then, N+Q≤9 and P+M≤9
solving we get ......
no of possible pairs as 3335.
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