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A straight line is given by r=(1+t)i+3tj...

A straight line is given by `r=(1+t)i+3tj+(1-t)k`, where `tinR`. If this line lies in th plane `x+y+cz=d`, then the value of `(c+d)` is

A

(a) `-1`

B

(b) `1`

C

(c) `7`

D

(d) `9`

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The correct Answer is:
(d)
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