Question

(given a =5, d=3, a = 50, find n and S​

Answer 1

Answer:

❣ ANSWER ❣

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an = 50 , a = 5 , d = 3 , n = ?? s = ??

an = a + ( n - 1 ) d

50 = 5 + ( n - 1 ) 3

45 = 3n - 3

3n = 48

n = 16

sn = n / 2 ( a + al )

= 16 / 2 ( 5 + 50 )

= 8 ( 55 )

= 440

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