Question

In an AP, if the common difference (d) is 2
and the 8th term (ag) is 11, then find the first
term.​

Answer 1

Answer:

d = 2, a8 = 11

an = a+(n-1)d

a8 = a + (8-1) 2

11 = a + 7 ×2

11 = a + 14

-14 + 11 = a

-3 = a

Answer 2

Answer:

Let a be the first term

Common difference = d = 2

8th term = a + 7d = a + 14

By the given condition

a + 14 = 11

a = - 3

So the first term = - 3

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