Question

the number of terms that are divided by 9 between 1 and 1000 are in AP then find number of terms​

Answer 1

mate AP is form like that,

9,18,27......999

so here,

a=9

d=9

an=999

so by using formula we get,

An=a+(n-1)d

999=9+9n-9

999=9n

n=999/9

n=111

so 111 terms.

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