If in a A.P fourth and seventh terms are $3 a + 2 d$ and $4 a + 4 d$ , then what is the nineteenth term?

(A) $8 a + 12 d$ (B) $7 a + 12 d$ (C) $8 a + 13 d$ (D) $7 a + 13 d$ solution:

Tags tnpsc maths

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