A) 2
B) \[{{3}^{n}}\]
C) \[{{4}^{n}}\]
D) \[{{2}^{n}}\]
Correct Answer: B
Solution :
We can obtain sum of coefficients by putting x = 1 in polynomial. Þ \[{{(1+x+{{x}^{2}})}^{n}}={{(1+1+1)}^{n}}={{3}^{n}}\].
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