Question

given l = 28 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? hird terms are 14 and 1​

Answer 1

Let a and d are first term and common difference for an AP.

Number of terms of AP is n

Last term =n

th

term =l=a

n

We have a=17,d=9,l=350

We know a+(n−1)d=350

⇒17+(n−1)9=350

⇒(n−1)9=350−17

⇒(n−1)9=333

⇒n−1=333/9

⇒n−1=37

⇒n=37+1

∴n=38

Therefore, number of terms in given AP is n=38

Answer 2

Answer:

I am dropping 35 thanks please keep 50 points question and also I am following you