[" 3.In the expansion of "(1+x)^(43)" ,i...

[" 3.In the expansion of "(1+x)^(43)" ,if the coefficients "],[" of "(2x+1)^(" th ")" and "(x+2)^(" th ")" terms are equal,then "],[" what is the value of "r(r!=1)?],[[" (a) "5],[" (b) "14],[" (c) "21],[" (d) "22]]

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