Two AP 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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A.P2 = -8,(-8+d).....
a4 = a+3d
Difference between their 4th term ;
= (-8+3d)-(-1+3d)
= -8+3d+1-3d
= -8+1
= -7
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