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

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Find the sum of all three-digit numbers that are divisible by (15) but not by (30).

Answer and explanation

Correct answer: (16200)

The numbers are (105,135,\ldots,975), and their sum is (16200). In this condition, the new AP has common difference (30).

Related tags

Divisible Not Divisible Three Digit Ap 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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