Question

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

let common difference be D

so first ap will be -1, d-1, 2d-1,3d-1

so 4tb term will be 3d -1

similarly in second ap 4th term will be 3d-8

so their difference will be

3d-1-3d+8

=7

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Answer 2

10-15=-5

14-19=-5

This is teh answer given below 2