how to count no. of pi electron in aromatic compound????????????and what is n in huckel rule

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Please find below the solution to the asked query:

https://www.meritnation.com/ask-answer/question/can-u-please-explain-me-the-huckel-rule-explaining-how-to-ca/hydrocarbons/3762661 

https://www.meritnation.com/ask-answer/question/what-is-huckels-rule-pl-explain-thank-you/organic-chemistry-some-basic-principles-and-techniques/1419476 

https://www.meritnation.com/ask-answer/question/what-is-huckels-rule/organic-chemistry-some-basic-principles-and-techniques/500133  

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