Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Let 
. If 
, then k is equal to _____.
Text Solution
Verified by ExpertsThe correct answer is:
239
(239)
Let 
The sum of odd coefficients:
Subtracting 
from above will give the answer
Now for 
Now use:
f( 
Only the term with 
from the first sum (i.e., 
) can contribute to 
, since all other 
gives 
From 
: the 
term is 
From 
: the coefficient of 
is
Hence, 
Now, 
So:
So:
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