Question

we have a=8 an = 62 sn =210 then find n and d

Answer 1

HEYA!

QUESTION:-we have a=8 an = 62 sn =210 then find n and d

ANSWER

We know that Sn= (n/2)[a + l] where l is the last term or nth term

Hence 210 = (n/2)[8 + 62]

210 = (n/2)[70]

35n = 210

Therefore, n = 6

Recall an= a + (n - 1)d

Tht is 62 = 8 + 5d

54 = 5d

∴ d = 54/5

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