Question

In expressinlon (x-2y+z)2 the aum of coefficient of xy,yz and zx is

Answer 1

Step-by-step explanation:

ANSWER

Substituting x=1, y=1, z=1 in the above expression, we get the sum of the binomial coefficients as

(x+2y+z)

10

=(1+2(1)+1)

10

(substituting x=1,y=1,z=1)

=(4)

10

Hence answer is D