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Question

If
(x2006+x2008+2)2010=a0+a1x+a2x2+......+a0xn.........(1)
then value of
a0−12a1−12a2+a3−12a4−12a5+a6+...... is

A
less than 2
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B
greater than 0
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C
equals 2
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D
none of these
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Solution

The correct options are
A less than 2
B greater than 0
Substituting x=w
we get
(w+w2+2)2010
=(1)
=a0+a1w+a2w2+a3+a4w+...
Substituting x=w2 we get
(w2+w4+2)2010=1
=a0+a1w2+a2w4+a3+a4w2+...
Adding both we get
2=2a0+(w+w2)a1+(w+w2)a2+2a3+...
2=2a0a1a2+2a3+...
1=a0a12a22+a3+...

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