Mathematics
In an A.P., if d = -4, n = 7, an = 4, then a is
6
7
20
28
AP GP
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Answer
We know that
an = a + (n - 1)d
∴ 4 = a + (7 - 1) × (-4)
⇒ 4 = a + 6 × (-4)
⇒ 4 = a - 24
⇒ a = 24 + 4
⇒ a = 28.
Hence, Option 4 is the correct option.
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