Question

If first term is 5 , 10th term is 23 , the sum of 10 terms is *​

Answer 1

Step-by-step explanation:

a = 5

n = 10

a10 = 23

a10 = a + ( n - 1 ) d

23 = 5 + ( 10 - 1 ) d

23 = 5 + 9 d

9d = 23 - 5

9d = 18

d = 18/9

d = 2

then we find sum of 10th term

sn = n / 2 ( a + an )

sn = 10/2 (5+ 23 )

sn = 5 (28)

sn = 140

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