Two APs have the same common difference. The first term of one of these is -1 and that of the other is -8. What is the difference between their 4 ℎ terms?
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Given two A.P's have same common difference.
Also given first term of one A.P is -1 and the other A.P is -8.
Let the common difference be d.
4th term of the A.P whose first term is -1 = - 1 + 3d
4th term of the A.P whose first term is -8 = -8+3d
Difference between the 4th terms of the A.P's ⇒
- 1 + 3d - (-8 + 3d) or -8 + 3d - (-1 + 3d)
- 1 + 3d + 8 - 3d or - 8 + 3d + 1 - 3d
7 or - 7 is the difference between 4th terms of the given A.P's.
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