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If each term of 6, 11, 16, … is multiplied by 2 and 3 is added, what will be the common difference of the new sequence?

Answer and explanation

Correct answer: 10

The original sequence is an arithmetic progression with common difference 11−6=5, also confirmed by 16−11=5. Transform each term t into 2t+3. If two consecutive original terms are t and t+5, their new values are 2t+3 and 2(t+5)+3. Their difference is [2(t+5)+3]−[2t+3]=10. Thus multiplication by 2 scales the original common difference from 5 to 10, while adding the same constant 3 to every term has no effect on differences because the two added constants cancel. The new sequence begins 15, 25, 35, …, whose differences are 10. Therefore option C is correct; 5 ignores the multiplication, 8 does not follow the transformation, and 13 is merely the transformed second term.

Related tags

Arithmetic ProgressionTransformationCommon DifferenceLinear TransformationIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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