The coefficient of in the expansion of
is
–144
132
144
–132
As we learnt in
General Term in the expansion of (x+a)^n -
- wherein
Where
We have to convert (1 - x - x2 + x3)6
Into normal expansion
We get
For coefficient of x7 in
Correct option is 3.
Option 1)
–144
This is the correct option.
Option 2)
132
This is an incorrect option.
Option 3)
144
This is an incorrect option.
Option 4)
–132
This is an incorrect option.
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