How many three digit number which are divisible and multiply by 11
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Ast Three Digit Divisible By 11 = 990
First Three Digit Divisible By 11 = 110
Using Sum Of Ap
N/2(220+(N-1) 11) = N/2(110+990)
220+11n-11=1100
11n=880+11
N=81
Other Way Of Doing =
Subtracting (Three Digit + Two Digit Multiples) By Two Digit Multiples
Highest Three Digit Divisible By 11 = 990
= 11*90
Two Digit Highest = 99
=11*9
Therefore Three Digit Multiples Of 11 = 90-9 = 81
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