Question

In AP last term is 28 and the the sum of all the nine terms of the AP is 144. Find the 1st term

Answer 1

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Answer 2

$\pink\bigstar$ Correct question

In AP last term is 28 and the the sum of all the nine terms of the AP is 144. Find the 1st term

$\blue\bigstar$ Correct answer

$\huge\pink\star{\green{\boxed{\boxed{\purple{\mathbb{a=4}}}}}}\pink\star$

$\green\bigstar$Given, l = 28.

s = 144 .

n = 9 .

∴ Sum of n terms, s = 144

⇒$\frac{n}{2}$ (a+l)=144.

⇒ $\frac{9}{2}$(a+28)=144

⇒a+28=144× $\frac{2}{9}$

⇒a=32−28

⇒a=4