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Q.

Let 3, 6, 9, 12,... upto 78 terms and 5, 9, 13, 17,... upto 59 terms be two series. Then, the sum of the terms common to both the series is equal to___.

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answer is 2223.

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Detailed Solution

For series of common terms
a=9, d=12, n=19
S19=192[2(9)+18(12)]=2223

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