Question

sn:? n:? where a:10 d:2 tn:80​

Answer 1

Answer:

n=36, Sn=1620

Step-by-step explanation:

Given that the sequence is in A.P.

we have a=10, d=2, tn =80

We know

tn = a+(n-1)d

80=10+(n-1)2

80=10+2n-2

80=8+2n

Dividing both sides by 2,

40=4+n

40-4=n

n=36

We know,

Sn=n/2×(a+tn)

Sn=36/2×(10+80)

Sn=18×90

Sn=1620

Hope so it helps.

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Thanks!

Answer 2

Answer:

THE VALUE OF N=36

AND Sn=1,620

MARK ME AS BRAINLIEST.......