Question

Let there be an A.P. with first term 'a', common difference 'd'. If an denotes its nth term and Sn the sum of first n terms, then find n and Sn, if a=5, d=3, and an=50​

Answer 1

Answer:

16&440

Step-by-step explanation:

a=5

d=3

an=50

an=a+(n-1)d

50=5+(n-1)3

50= 5+3n-3

50=2+3n

48=3n

16=n

sn = n/2(2a+(n-1)d)

16/2(2×5+(16-1)3)

8(10+15×3)

8(10+45)

8×55

440

hope it helps

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