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Question

Assertion :Position vector of a point R, which divides the line joining the points P(ˆi+2ˆj−ˆk) and Q(−ˆi+ˆj+ˆk) in the ratio 2 : 1 internally is −13ˆi+43ˆj+13ˆk Reason: →r=m→b−n→am−n

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is correct but Reason is incorrect
The point R which divides the line joining the point P(a) and Q(b) in the ratio m : n,
R=mb+nam+n
m=2,n=1,a=ˆi+2ˆjˆk and =ˆi+ˆj+ˆk
Ris2×(ˆi+ˆj+ˆk)+1×(ˆi+2ˆjˆk)2+1
R=13ˆi+43ˆj+13ˆk

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