Question

the sum of the first 8 terms of an AP is 100 and the sum of the first 19 terms is 551, find the first term and common difference of the AP​

Answer 1

Answer:

Explanation:

First we will list the data we are given.

The sum of the first 8 terms of the A.P is = 100.

The sum of the first 19 terms is = 551.

Now Let The First term of the A.P be a, and the common difference be d.

So, According to the problem,

×x82[a+a+(8−1)d]=100

⇒4[2a+7d]=100

Answer 2

Answer:

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