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Common Difference

If a1, a2, a3...

Question

If $a_{1}, a_{2}, a_{3}$ .... a_{n} are in A. P., then the common difference is--

A

a_{2} - a_{1}

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B

a_{4} - a_{3}

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C

a_{n} - a_{n - 1}

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D

a_{7} - a_{6}

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Solution

The correct option is D $a_{7} - a_{6}$
We know if some no. are in A. P., then the difference between any term and the term preceding to it will be constant, this difference is known as common difference. Here, in the options we can see that the difference between a term and a term preceding to it is given so all the options are correct.

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