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

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

anteater · Answer

I am wondering if this problem is worded correctly. It seems to me that A, B, and D would all appear in the expansion, but C would not. I am wondering if the question should be "Which of these does not appear?"

anteater · Answer

Or are you allowed to choose more than one answer? If that is the case, then A, B, and D. :)