Question

the first & last terms of an ap are 17 and 350 respectively. if the common difference is 9 how many terms are there & what is there sum?

Answer 1

Hey friend

Here is your answer

a=17

an=350

d=9

an=a+(n-1)d

350=17+(n-1)9

350-17=(n-1)9

333=(n-1)9

n-1=333/9

n-1=37

n=38

Sn=n/2(a+an)

Sn=38/2(17+350)

Sn=19(367)

Sn=6973

Hope this helps you

Answer 2

HELLO......FRIEND!!

THE ANSWER IS HERE,

First term (a) = 17.

common difference (d)=9.

Last term (l) =350.

an = a+(n-1)d.

=> 350 =17+(n-1)9

=> (n-1)9=333

=> n-1=37

=> n=38.

So, There are 38 terms.

Sum of all the 30 terms ,

$= > \: s = \frac{n}{2} (a + l)$

$= > \: \frac{38}{2} (17 + 350)$

$= > \: 19(367)$

=> 6973.

So, The sum of the terms is 6973.

:-)Hope it helps u.