Question

The first term of an A.P. is 5, the last term is 45 and the sum is 400.
Find the number of terms and the common difference.
द फर्स्ट नंबर ऑफिस 5 प्लॉट नंबर 235 द सम ऑफ 44 एंड फाइंड द नंबर फ्रॉम एंड कॉमन डिफरेंस ​

Answer 1

Answer:

The answer is 8 terms in ap

Answer 2

Values of n = 16 and

Values of n = 16 and d = 8/3

Step-by-step explanation:

Let a , d , l are first term , common difference and last term of an A.P , respectively.

given ,

a = 5, l = 45

We know that,

Substitute values of a and l , we get,

=> 45 = 5+(n-1)d

=> 45-5 = (n-1)d

=> (n-1)d=40 ----(1)

\* given *\

Now ,

Substitute n=16 in equation (1), we get

(16-1)d = 40

=> 15d =40

=> d = 40/15

=> d = 8/3

Therefore,

Values of n = 16 and

d = 8/3