Find the first four terms of the indicated expansion.
15
A. x30 + 
x28y + 
x26y2 + 
x24y3 + . . .
B. x30 + 
x28y + 
x26y2 + 
x24y3 + . . .
C. x15 + 
x14y + 
x13y2 + 
x12y3 + . . .
D. x30 + 
x28y + 
x26y2 + 
x24y3 + . . .
Answer: A
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A. 
B. 
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A. 
B. 
C. 
D. 