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nth Term of an AP

If an denotes...

Question

If $a_{n}$ denotes the nth term of the AP 3, 8, 13, 18, ... then what is the value of $(a_{30} - a_{20})$
(a) 40 (b) 36 S(c) 50 (d) 56

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Solution

Given first term is 3
And common difference is 5

and we know

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