If 3rd term of an A.P. is 6 and 5th term of that A.P. is 12. Then find the 21st term of that A.P.

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If 3<sup>rd</sup> term of an A.P. is 6 and 5<sup>th</sup> term of that A.P. is 12. Then find the 21<sup>st</sup> term of that A.P.