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How many two digit numbers are divisible...

How many two digit numbers are divisible by 3?

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The numbers are 12,15,18 ……….. 99.
It is an A.P . Find n.
`T_(n)=a+(n-1)d`
`therefore99=12+(n-1)3rArr99=12+3n-3rArr90=3nrArrn=30`.
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