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In $\triangle XYZ$, $XY = 6$ cm. If M and N are two points on XY and XZ respectively such that $MN \parallel YZ$ and $XN = \frac{1}{4} XZ$, then the length of XM is :
- (a)$1.2$ cm
- (b)$1.5$ cm
- (c)$2$ cm
- (d)$4$ cm
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(B) $1.5$ cm