whch one of the following is not an AP:

(A)13,8,3,-2,-7,-12

(B) 10.8,11.2,11.6,12,12.4

(C) 81/7,18 2/7,28 3/7,48 4/7,58 5/7

(D) 8 3/23,11 6/23,14 9/23,17 12/23

u have to say the reason ?????

(A) T₂-T₁=8-13=-5 T₃-T₂=3-8=-5 T₄-T₃=-2-3=-5 T₅-T₄=-7-(-2)=-5 T₆-T₅=-12-(-7)=-5 , it is an AP

(B) T₂-T₁=11.2-10.8=0.4 T₃-T₂=11.6-11.2=0.4 T₄-T₃=12-11.6=0.4 T₅-T₄=12.4-12=0.4 , it is an AP

(C)T₂-T₁=10.14.. T₃-T₂=10.14.. T₄-T₃= 20.14.. T₅-T₄=10.14.. , it is not an AP

(D) T₂-T₁= 3.13.. T₃-T₂= 3.13.. T₄-T₃= 3.13.. , it is an AP

therefore the correct answer is (C) 8 1/7,18 2/7,28 3/7,48 4/7,58 5/7

THUMBSS UPPLZZZ!!!!! :D

(A) T₂-T₁=8-13=-5 T₃-T₂=3-8=-5 T₄-T₃=-2-3=-5 T₅-T₄=-7-(-2)=-5 T₆-T₅=-12-(-7)=-5 , it is an AP

(B) T₂-T₁=11.2-10.8=0.4 T₃-T₂=11.6-11.2=0.4 T₄-T₃=12-11.6=0.4 T₅-T₄=12.4-12=0.4 , it is an AP

(C)T₂-T₁=10.14.. T₃-T₂=10.14.. T₄-T₃= 20.14.. T₅-T₄=10.14.. , it is not an AP

(D) T₂-T₁= 3.13.. T₃-T₂= 3.13.. T₄-T₃= 3.13.. , it is an AP

therefore the correct answer is (C) 8 1/7,18 2/7,28 3/7,48 4/7,58 5/7

THUMBSS UPPLZZZ!!!!! :D