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]

Question : 2 of 79

Marks: +1, -0

What is the ratio of the first term of A to that of B ?

[NDA II 2022]

1∕3
2∕5
3/4
3∕5

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