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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 two-digit numbers that leave remainder (3) when divided by (8).

Answer and explanation

Correct answer: (660)

The numbers are (11,19,\ldots,99), and the sum of (12) terms is (660). In remainder questions, the common difference equals the divisor.

Related tags

Remainder Two Digit 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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