If n is a positive integer, then the binomial coefficients equidistant from the beginning and end in the expansion of (x+a)^n   a. equal. b. multiplicative inverse of each other. c. reciprocal to each other. d. additive of each other.   2. if the rth term in the expansion of (x^3/3-2/X^2)^10 contains x^20 , then r is?   2,3,4, or 5

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