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Number of polynomials p(x) with integral coefficients satisfying the condition p(1)=2 and p(3)=1 are

$\begin{array}{1 1}(A)\;0&(B)\;1\\(C)\;2&(D)\;\text{infinite}\end{array} $

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1 Answer

If $p(x)$ is one such polynomial.
$p_1(x)$ be such that
$p(x)-1=(x-3)p_1(x)$
$\Rightarrow p(1)-1=-2p_1(1)$
$\Rightarrow 1=-2p_1(1)$
$\Rightarrow p_1(1)=-\large\frac{1}{2}$
This is not possible as $p_1(1)$ is an integer.
Hence no such polynomial is possible.
Hence (A) is the correct answer.
answered Apr 16, 2014 by sreemathi.v
 

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