In: Advanced Math
find the coefficient for the terms
(A) What is the coefficient for the term x 4y 3 in (x + y) 7 ?
(B) What is the coefficient for the term x 4y 3 in (x − y) 7 ?
(C) What is the coefficient for the term x 2y 3 z 2 in (x + y + z) 7 ?