We report the first observation of $B^0 o X(3872) (K^{+}pi^{-})$ and
evidence for $B^+ o X(3872) (K^{0}pi^{+})$. We measure the product of
branching fractions for the former to be ${cal B}(B^0 o X(3872) (K^+ pi^-))
imes {cal B}(X(3872) o J/psi pi^+ pi^-) = (7.9 pm 1.3(mbox{stat.})pm
0.4(mbox{syst.})) imes 10^{-6}$ and find that $B^{0} o X(3872)
K^{*}(892)^{0}$ does not dominate the $B^{0} o X(3872)K^{+}pi^{-}$ decay
mode. We also measure ${cal B}(B^+ o X(3872) (K^0 pi^+)) imes {cal
B}(X(3872) o J/psi pi^+ pi^-) = (10.6 pm 3.0(mbox{stat.}) pm
0.9(mbox{syst.})) imes 10^{-6}$. This study is based on the full data sample
of 711~fb$^{-1}$ ($772 imes 10^6 Bar B$ pairs) collected at the
$Upsilon(4S)$ resonance with the Belle detector at the KEKB collider.
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