Question

In an AP, if d=-4 & the 7th term is a7 is 4, then find the first term​?

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

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Here, d = –4

And,

7th term = 4

a7 = 4

{since an = a+(n–1)×d}

a+(7–1)×d = 4

a+6d = 4. (equation 1st)

putting the value of d in equation 1.

a+6×(–4) = 4

a—24 = 4

a = 4+24

a = 28

Hence, the first term of the AP is 28.

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