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The number of ordered pairs (m,n) m,n€{1,2,3,...,100} such that 7m +7n is divisible by 5 is ___
to divisible by 5 unit digit must be either zero or 5 here exponent of 7 can be(7,9,3,1) at unit digit and to make sum 0 or 5 it should be(7+3) or (9+1)to take 7+3(71+73) and (75+73)...................................(799+73)(71+77)...........................................................(799+77)in this way you can apporach it
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