Question

Two APs have the same common difference. The first term of one of these is -1 and the other one is -8. Find the difference between their 4th terms.

Answer 1

Answer:

the answer is 7

Step-by-step explanation:

given a1= -1 and a2= -8

let common difference of both AP's be d

difference between their fourth terms = a1+ 3d-(a2 + 3d)

                                                                = a1-a2

                                                                = -1-(-8)

                                                                = 7