Question

*In an AP, if d = –4, n = 7, tn = 4, then a is ………………*​

Answer 1

Step-by-step explanation:

In an AP, an = a + (n-1)d

⇒ 4 = a + (7-1)(-4) [by given conditions]

⇒ 4 = a + 6(-4)

⇒ 4 + 24 = a

∴ a = 28

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