Question

10) In an A.P. if the 4th term is 9, common difference is 2, 3rd term is A) 2 B) 3 C) 5 D) 7​

Answer 1

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Here is your answer :-)

Option D

7

$a4 = 9\\ d = 2 \\ a3 = ? \\ a = ? \\a4 = a + (n - 1)d$

$9 = a - (3)2 \\ 9 = a + 6 \\ 9 - 6 = a \\ a = 3 \\ a3 = 3 + 2 \times 2 \\ a3 = 3 + 4$

$a3 = 7$