Question

Let there be an ap with first term as 'a' common difference as 'd' if an denotes it's nth term and sn the sum of the first n terms, find n and sn if a=5 d=3 an=50

Answer 1

Answer:

a=5

d=3

an= 50

an= a+(n-1) d

50 = 5 +(n - 1) 3

50 = 5+ 3n - 3

50 = 2 + 3n

50 - 2 = 3n

48 = 3n

n= 48/3

n= 16

Sn = n/2(a+an)

S16 = 16/2 (5+50)

= 8(55)

S16 = 440

Step-by-step explanation:

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