Math, asked by anish69, 1 year ago

a=5,d=3,an=50 find n and sn

Answers

Answered by AshPatel
6
an = a + (n-1) d
50 = 5 + (n-1) 3
(n-1) 3 = 45
n-1 = 15
n = 16

Sn = n/2 ( a + l ). l is the last term in the sequence of whose sum you want to know
= 16/2 (5 + 50)
=8 (55)
=440

Hope this helps
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Answered by pia14
0
an = a+ (n-1)d
50=5+(n-1)3
50-5=(n-1)3
45/3=n-1
15+1=n
n=16
sn=n/2(a+an)
sn=16/2(5+50)
=8×55
sn=440
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