Question

find the 10th term from end of A.P. 4,9,14.....254?​

Answer 1

Answer:

an= 4

n=10

a= 254

d= 9-4= -5

an=a+ (n-1)d

4= a+ 9× (-5)

4= a - 45

a= 49

Answer 2

Answer: the 10th term from end will be 209

Step-by-step explanation: it is clear from the question that common diffrence is +5 . And last term is 254

Now ,

We know that

To calculate any term in ap we use the formula a+(n-1)*d.

Thus putting a=4 , d=5 and nth term = 254 gives n=51.

Now we to calculate 10 th term from last we simply reverse the swquence that is we put d= -5 .

Thus a+ (10-1)*d = 254 +9*-5.

= 254-45

= 209.

Thus the required answer is 209