The 20th term of an arithmetic sequence is 80 and its 21st term is 84. then difference between any two terms could be

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Solution

The correct option is C
24

Given $x_{21} = 84 & x_{20} = 80$

$\Rightarrow$ common difference =84-80

=4

$\Rightarrow$ Difference between any two terms could multiple of 4.

In the given options 24 is the only one which is multiple of 4

$∴ 24$ could be the difference between any 2 terms of arithmetic sequence

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