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The first and last terms of an ap are 17 ,350 respectively if common difference is 9 how many terms are there and what is their sum

Posted by Bhoomi Bhoomi 4 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Aakash Anand 4 years, 6 months ago

A= 17 D= 9 Añ and lest terms = 350 Añ= a + (n-1)d # 350= 17 + (n-1)9 # 350- 17 =( n-1 )9 # 333= (n-1)9 # 333/9 = n-1 # 37 = n -1 # 37 + 1 = n @ n = 38 # Sun = n/2 (a + l) = 38 /2 (17 + 350) = 19 × 367 = 6973 Ans....... ........ Aakash Anand ?

4Thank You

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CBSE > Class 10 > Mathematics