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?Ď terms
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4th term of first AP is -1+3d
and 4th term of AP is -8+3d
and
the difference of there 4th term is
(-1+3d) - (-8+3d) = -1+3d+8-3d = -1+8 =-7
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