Find the algebraic expression to express the following number series :

5,9,13,17,21,25..... (n=1,2,3....)

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4n + 1

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4n - 1

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5n - 1

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Solution

The correct option is B
4n + 1

Each number in the above series can be expressed as (4n+1), where n= 1,2,3,......

5 = 4(n) +1, when n=1

9= 4(n) +1, when n= 2 and so on..

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