Question

in an ap
given a = 8,an = 62,Sn = 210,find n and an.

Answer 1

an is given we only want to find n

$a_{n} = 62 \\ s_{n} = \frac{n}{2} (a + a_{n}) \\2 10 = \frac{n}{2} (8 + 62) \\ 210 = \frac{n}{2} (70) = 35n \\ n = \frac{210}{35} = 6$

n=6

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Answer 2

sn=n/2×a+an 210=n/2×8+62 210=n/2×70 210×2=n×70 420=70n 420/70=n 6=n

i think you want difference if it is correct no problem if it is wrong no problem