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Sum of n Terms

The ratio of ...

Question

The ratio of the sum of n terms of two A.P's is (7n + 1) : (4n + 27). The ratio of their 12^thterms is:

169 : 123

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176 : 127

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162 : 119

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155 : 115

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Solution

The correct option is C
162 : 119

Let a₁, a₂, d₁, d₂ be the first terms and common differences of two A.P's respectively.

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