Question

The first team of an A.P is -3 and the 10th tearm is 15 ,find the value of S10

Answer 1

Answer:

see in picture answer of your question

Answer 2

Answer:

ANSWER :- S10 = 60.

Step-by-step explanation:

Given :- a = -3

a10 = 15

To find :- value of S10

= a10 = 15

= a + 9d = 15

= (-3) + 9d = 15 ( Since :- a = -3 )

= 9d = 15 + 3

= d = 18/9

= d = 2

$sn \: = \: \frac{n}{2} (2a \: + (n \: - \: 1) \times d)$

S10 = 10/2 ( 2 * (-3) + ( 10 - 1 ) * 2 )

S10 = 5 ( -6 + 9 * 2 )

S10 = 5 * 12

S10 = 60

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