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Formula for Sum of n Terms of an AP

Two AP's have...

Question

Two AP's 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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Solution

Given,
a1= - 1
A1= - 8

d=D=d(common difference)

Difference of their 4th term=
A4-a4=A13d-a13d
=3d(-1+8)
=3d*7
=21d

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