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 this sum
shadowsabers03:
350 - 17 = 333
333 / 9 = 37
37 + 1 = 38
There are 38 terms.
17 + 350 = 367
367 x 38 = 13946
13946 / 2 = 6973
6973 is the sum.
Answers
Answered by
2
a (n)= a+(n-1)×d
350= 17+ (n-1)×9
333= 9n-9
342=9n
n=342/9=38
Total terms=38
350= 17+ (n-1)×9
333= 9n-9
342=9n
n=342/9=38
Total terms=38
Sum?
Where's the sum?
what are you saying
oh i didn't see you want the sum also
Answered by
3
350=17+(n-1)9
350=17+9n-9
350=8+9n
9n=342
n=38
Sum?
Where's the sum?
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