Question

find the sum of 12 term when a1= 4 d= 10​

Answer 1

Hey

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Answer 2

Find the sum of 12 term when a1= 4 d= 10.

Refer the attachment for your answer.

The answer is 708.

As we have to find the sum, Use the formula :

$\tt{S _{n} =\frac{n}{2} (2a + (n - 1)d)}$

Hence, Put the given values of n, a , d

Here, In your question,

a = 4

d = 10

n = 12

Thus, Substituting the values, We get the answer.

The answer to your question is 708.