Answer :

Given:

• d = – 4

• a7 = 4

To find: a (first term)
Explanation:

Now, in an AP we know,

an = a + (n – 1)d

Where an is the nth term in the AP, d is the common difference, and a is the first term in the AP.

Putting values in the above equation for n = 7

a7 = a + 6d

⇒ 4 = a + 6( – 4)
⇒ 4 = a - 24

a = 28


∴ The first term is 28.

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