this questions belong to binomial theorem.
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★ BINOMIAL EXPANSION ★
In first approach , use - ( I + f ) ( 1 - f ) = 1 , it's a direct result obtained while solving these questions ,
while in second , For n = 1 , no. of terms goes 3 , For n = 2 , no. of terms = 5 , it's an odd sequential expansion , hence , 2n + 1 terms
while in 3rd , considering the rational coefficients and finding that r = a minimum multiple of 3 gives sum total of 5 cases possible for rational coefficients by substituting r = 0 , 3 , 6 successively
★✩★✩★✩★✩★✩★✩★✩★✩★✩★✩★
In first approach , use - ( I + f ) ( 1 - f ) = 1 , it's a direct result obtained while solving these questions ,
while in second , For n = 1 , no. of terms goes 3 , For n = 2 , no. of terms = 5 , it's an odd sequential expansion , hence , 2n + 1 terms
while in 3rd , considering the rational coefficients and finding that r = a minimum multiple of 3 gives sum total of 5 cases possible for rational coefficients by substituting r = 0 , 3 , 6 successively
★✩★✩★✩★✩★✩★✩★✩★✩★✩★✩★
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