The common difference of the A.P. is
A. 2b
B. –2b
C. 3
D. –3
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Answer:
common difference of the A.P is
D=t2 -t1
t1=2b, t2=-2b
D= -2b-2b
= -4b
t4=-3, t3=3
D=-3-3
=-6
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