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If (y,,y+6,,y+12,\ldots) is an arithmetic progression, what is the common difference?

Answer and explanation

Correct answer: (6)

The common difference of an arithmetic progression is found by subtracting one term from the next. The first term here is \(y\), and the second term is \(y+6\). Thus \((y+6)-y=6\), because the two occurrences of \(y\) cancel. The third term confirms the pattern: \((y+12)-(y+6)=6\).

Therefore each term is obtained by adding 6 to the preceding term, so the common difference is 6. The value of \(y\) is not needed; it may be any suitable number, because it cancels during subtraction. Option A is only the first term, and option D is the total increase across two steps, not one step. Hence option C is correct.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9Easy

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