It is known that any multinomial coefficient can be expressed as the product of a sequence of related binomial coefficients. For five points, express the multinomial coefficient 10M{2,3,5} as a product of binomial coefficients. Hint: the first one is10C2. For five more points, give a general formula for calculating the multinomial coefficient nM{a,b,c,d}, where a+b+c+d=n.