Question
Question: The coefficient of a<sup>3</sup>b<sup>6</sup>c<sup>8</sup>d<sup>9</sup>ef in the expansion of (a + b...
The coefficient of a3b6c8d9ef in the expansion of (a + b + c – e – f)20 is –
A
123450
B
213456
C
256312
D
None of these
Answer
None of these
Explanation
Solution
3 + 6 +8 + 9 +1 + 1 = 28 > 20
Ž coefficient is zero because no term is there.