Question

if a=8,an=62 and sn=210 gives us so find n and d

Answer 1

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