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Find the sum of all 3 digit naturals wh...

Find the sum of all 3 digit naturals which are divisible by 9.

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The sequence is 108 ,117 ,126 ,… 999 Find 'n' and `S_(n)` .
`T_(n)=a+(n-1)d=rArr999=108+(n-1)9rArr999=108+9n-9`
`999 =99+9nrArr9n=900rArrn=100`
`S_(n)=(n)/(2)(a+l)=(100)/(2)(108+999)=50(1107)=55350`
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