If a1,a2,a3 .... a_{n} are in A. P., then the common difference is--
A
a2−a1
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B
a4−a3
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C
an−an−1
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D
a7−a6
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Solution
The correct options are Aa2−a1 Ba4−a3 Can−an−1 Da7−a6 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.