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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first $n$ terms of an APMedium

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Find the sum of all (3)-digit numbers that are divisible by (9).

Answer and explanation

Correct answer: (60984)

The AP is (108,117,\ldots,999) with (100) terms, so the sum is (55350), not (60984). Find the last term and number of terms carefully.

Related tags

Three Digit Numbers Divisibility Ap Sum Finding The Sum Of The First $N$ Terms Of An Ap Finding The Sum Of The First N Terms Of An Ap Arithmetic Progressions (Ap)Arithmetic Progressions Ap Mathematics

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