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=2a0−a1−a2+2a3+... 1=a0−a12−a22+a3+...