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Questions  >>  CBSE XII  >>  Math  >>  Relations and Functions
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Find the value of $\lambda$, so that the lines $\frac{1-x}{3} = \frac{7y - 14}{2 \lambda} = \frac{z-3}{2} \;and\; \frac{7-7 \lambda}{3 \lambda} = \frac{y-5}{1} = \frac{6-z}{5} $ are at right angle


$(A)\; \lambda = -\frac{70}{11}$
$(B)\; \lambda = \frac{66}{11}$
$(C)\; \lambda = \frac{70}{11}$
$(D)\; \lambda = -\frac{66}{11}$

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