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NDA Math Sequences and Series

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Consider the following for the next three (03) items that follow :
Let P be the sum of first n positive terms of an increasing arithmetic progression A. Let Q be the sum of first n positive terms of another increasing arithmetic progression B. Let P:Q=(5n+4):(9n+6)
[NDA II 2022]
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If d is the common difference of A, and D is the common difference of B, then which one of the following is always correct ?
[NDA II 2022]
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