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What is the common difference of (x, x + √5, x + 2√5, x + 3√5)?

Answer and explanation

Correct answer: √5

The governing concept is the common difference of an arithmetic progression. It is found by subtracting each term from the following term. Here, (x + √5) − x = √5. Checking the next pairs gives (x + 2√5) − (x + √5) = √5 and (x + 3√5) − (x + 2√5) = √5. Since the same quantity is added every time, the sequence is an AP with common difference √5. Therefore option B is correct. The symbol x is the initial term’s fixed part and disappears when consecutive terms are subtracted. Option C is twice the actual step, while option D is a complete term of the sequence rather than the difference between two terms. The result does not depend on the particular value of x.

Related tags

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

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