Question

in an Ap : Given a=5, n=10, sn=320 find d​

Answer 1

Answer:

d = 6

Step-by-step explanation:

a = 5

n = 10

S10 = 320

d = ??

Sn = n [2a + (n - 1)d]

        2

320 = 10 [2*5 + (10 - 1)d]

            2

320 = 5 [10 + 9d]

10 + 9d = 64

9d = 54

d = 6

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