Question

how many terms are there in ap 41,38,35,...,-1​

Answer 1

Answer:

13

Step-by-step explanation:

AP:  41,38,35,...,-1​

Formula for nth term of AP: An = a + (n-1)d

In given case:  a= 41 and d=a2-a1=38-41=-3

Now, lets find the value of n:

-1 = 41 + (n-1)*(-3)

-1-41=-3n+3

-42 = -3n+3

- 3n=-39

n=13

Therefore the number of terms is 13