Question

Say whether each of the following is an AP or GP or neither
(A)1,4,9,16,,,,,
(B)1.7,2,2.3,2.6,,,,,,
(C)640,-320,160,-80,,,,,
(D)125,25,5,1,,,,,

Answer 1

B AP; d=0.3

Answer 2

(A) AP (Arithmetic Progression) with common difference 3
(B) Neither AP nor GP
(C) GP (Geometric Progression) with common ratio -1/2
(D) GP with common ratio 1/5