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In an AP, if d = -4, n = 7, and a_n = 4 then find a.

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answer is C.

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Detailed Solution

We know that the n^th term of an AP is given as a_n = a + (n – 1)d
Putting the values given, we get,
4 = a + (7 – 1)(-4)

$\Rightarrow$ a = 4 + 24

$\Rightarrow$ a = 28

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