Question

the first & last term of AP are 17 & 350 respectively. If the common difference is 9then how many terms are their & and what is their sum

Answer 1

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Answer 2

Hey user !!

Here is your answer !!

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Given ->

a=17

L= 350

d = 9

using the formula

an= a+ (n-1) d

350= 17 +(n-1) 9

350 - 17 = (n-1) 9

333 /9 = (n-1)

37 = n-1

n = 37 +1

n=38

Sn= n/2 ( a+ l)

Sn =38/2 ( 17 + 350)

Sn = 19 (367)

Sn = 6973

Hope it is satisfactory :-)

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