125

Part of 1947 Moscow Mathematical Olympiad

Problems(1)

MMO 125 Moscow MO 1947 coefficients of x^{17} and x^{18} from (1+x^5+x^7)^{20}

Source:

Find the coefficients of

x^{17}

x^{18}

after expansion and collecting the terms of

(1+x^5+x^7)^{20}

polynomialcoefficientsalgebra