two APs have the same common difference. The first term of one of these is -1 and that of the other is -8 . Then the difference between their 4th term is
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Answer:
7
Step-by-step explanation:
Common difference of both are same =d
For first Ap
a1=-1. d=d
We know
an=a+(n-1)d
a4=-1+(4-1)d
a4=-1+3d
Now
For second Ap
a1=-8. d=d
a4=-8+(4-1)d
a4=-8+3d
Difference between 4th term of 1st and second Aps
=-1+3d-(-8+3d)
=-1+3d+8-3d
=7
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