In this video Natwar Mishra sir has explained a question from ARIHANT previous year solved questions on JEE MAINS.
Q. The value (π.1π·0βπ.2π·1+π.3π·2ββ¦β¦upto 51th term)+(1!-2!+3!-β¦β¦.upto 51th term) is equal to
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https://www.youtube.com/watch?v=xAcyr2815Gw