There's actually a really good shortcut for nCr. nCr => So take 2 terms from n! and divide by r! Ex: 8C2, 8x7/2x1 = 28 Proof: nCr = n!/(n-r)!xr! = n(n-1)(n-2).....(n-r)!/(n-r)!xr! = [cancel (n-r)! in numerator and denominator] = n(n-1)(n-2)...../r! Ex: 8C2 = 8!/(8-2)!x2! = 8x7x6!/6!x2! = [6! Cancelled in both numerator and denominator] = 8x7/2x1 = 28
Kaani ivi important. Import a nt ante IPE laaga 10 questions ala undavu JEE po, important ante max 3 to 4 questions istaaru, endukante anni chapters 30 questions lo paatinchalante chaala kashtam, so takku wightage ante almost 0 questions anni. Ekkuva ante 2 or 3 questions. Vaatito 10+ marks vastayi, which is a lot. Anduke important. JEE Mains and advanced lo important anter 2 or 3 question maatrame
There's a good shortcut actually nCr, so take 2 terms from n! and divide by r! Ex: 8C2, 8x7/2x1 = 28 Proof: nCr = n!/(n-r)!xr! = n(n-1)(n-2).....(n-r)!/(n-r)!xr! = [cancel (n-r)! in numerator and denominator] = n(n-1)(n-2)...../r! Ex: 8C2 = 8!/(8-2)!x2! = 8x7x6!/6!x2! = [6! Cancelled in both numerator and denominator] = 8x7/2x1 = 28
🎉🎉🎉🎉🎉🎉NAVEEN SIR CLASSES TAKING FOR WHOLE ORGANI CHEMISTRY 🎉🎉🎉🎉🎉 AND WE PRAY GOD TO RECOVER THE HEALTH ISSUE OF NAVEEN SIR
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There's actually a really good shortcut for nCr.
nCr => So take 2 terms from n! and divide by r!
Ex: 8C2, 8x7/2x1 = 28
Proof: nCr = n!/(n-r)!xr! = n(n-1)(n-2).....(n-r)!/(n-r)!xr! = [cancel (n-r)! in numerator and denominator] = n(n-1)(n-2)...../r!
Ex: 8C2 = 8!/(8-2)!x2! = 8x7x6!/6!x2! = [6! Cancelled in both numerator and denominator] = 8x7/2x1 = 28
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Kaani ivi important. Import a nt ante IPE laaga 10 questions ala undavu JEE po, important ante max 3 to 4 questions istaaru, endukante anni chapters 30 questions lo paatinchalante chaala kashtam, so takku wightage ante almost 0 questions anni. Ekkuva ante 2 or 3 questions. Vaatito 10+ marks vastayi, which is a lot. Anduke important. JEE Mains and advanced lo important anter 2 or 3 question maatrame
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8c2
28
There's a good shortcut actually
nCr, so take 2 terms from n! and divide by r!
Ex: 8C2, 8x7/2x1 = 28
Proof: nCr = n!/(n-r)!xr! = n(n-1)(n-2).....(n-r)!/(n-r)!xr! = [cancel (n-r)! in numerator and denominator] = n(n-1)(n-2)...../r!
Ex: 8C2 = 8!/(8-2)!x2! = 8x7x6!/6!x2! = [6! Cancelled in both numerator and denominator] = 8x7/2x1 = 28
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