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What is the common difference of the sequence (a_n=7-0.5n)?

Answer and explanation

Correct answer: (-0.5)

An arithmetic progression can be written in the form a_n=a_1+(n-1)d, so the coefficient of n in a linear expression for its terms equals the common difference. Here a_n=7-0.5n. Increasing n by 1 changes the term by -0.5: a_{n+1}-a_n=[7-0.5(n+1)]-[7-0.5n]=-0.5. Thus the sequence decreases by one-half at every step, and its common difference is -0.5. Option D is correct. Option B gives the magnitude but misses the negative sign, while options A and C confuse the constant or the coefficient with the required difference.

Related tags

Arithmetic ProgressionCommon DifferenceLinear SequenceDecimal NumbersIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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