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What is the common difference of (0.2, 0.02, −0.16, −0.34, …)?

Answer and explanation

Correct answer: −0.18

The common difference of an arithmetic progression is obtained by subtracting a term from the following term. Using the first two terms, d = 0.02 − 0.20 = −0.18. Verify the result with the next pairs: −0.16 − 0.02 = −0.18, and −0.34 − (−0.16) = −0.34 + 0.16 = −0.18. Since the difference remains constant, the sequence is an AP with common difference −0.18, so option A is correct. The negative sign shows that the terms decrease by 0.18 each time. Option B has the correct magnitude but wrong sign, option C comes from incorrect decimal subtraction, and option D is a term of the sequence rather than the difference.

Related tags

Arithmetic ProgressionDecimal SubtractionCommon DifferenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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