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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,,,,,

B AP; d=0.3

(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

Did you know?

Did you know that the sequence (A) 1, 4, 9, 16,... is an example of a perfect square sequence? In this sequence, each term is formed by squaring consecutive natural numbers. Did you know that the sequence (B) 1.7, 2, 2.3, 2.6,... is not an arithmetic progression (AP) or a geometric progression (GP)? This sequence does not follow any consistent pattern of adding or multiplying a constant value to each term. Did you know that the sequence (C) 640, -320, 160, -80,... is an example of a geometric progression (GP)? In this sequence, each term is formed by multiplying the previous term by -0.5. Did you know that the sequence (D) 125, 25, 5, 1,... is not an arithmetic progression (AP) or a geometric progression (GP)? This sequence does not follow any consistent pattern of adding or multiplying a constant value to each term.