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The first and the last term of an AP are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is the sum?

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asked Mar 13, 2018 in Mathematics by paayal (26,720 points) ● 4 ● 6 ● 11
edited Mar 13, 2018 by paayal
The first and the last term of an AP are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is the sum?

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answered Mar 13, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Mar 15, 2018 by faiz
 
Best answer

Solution: an = 350=17+9(n-1)

➪​9(n-1) =350-17=333

➪n-1=333/9=37

➪n=38

Now, S38=38/2(17+350)=19 x367=6973

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