Question

Which of the following terms appear in the expansion of (x + y)10? The letter a in each term represents a real constant.
A. ax3y7
B. ax6y4
C. ax5
D. ax4y6

Answer 1

the answer is D. ax4y6
proof 

the binome of newton is   S a x^k y^n-k = (x+y)^n, for k=0...n
for n=10, it is   a y^10+...+  a x4 y^10-4 +...+ax^10

                     

Answer 2

Answer:

ax^3y^7

ax^4y^5

ax^5y^4

Step-by-step explanation:

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