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

the first and the last terms of an AP are 17 and 350 respectively. If

1.	the first and the last terms of an AP are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is their sum?
Answer» An=a+(n-1)d( by using this we can find the SOLUTION) Given An= 350 a=17 d=9 n=¿ so just put the value 350=17+(n-1)9 350-17=9n-9 333=9n-9 333+9=9n 342=9n 342÷9=n 38=n show the NUMBER of term is 38 Sn = n/2(a+an) sn=38/2(350+17) Sn=19(367) Sn=6973

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

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