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=m→b+n→am+n ⇒m=2,n=1,→a=ˆi+2ˆj−ˆk and →=−ˆi+ˆj+ˆk ∴→Ris2×(−ˆi+ˆj+ˆk)+1×(ˆi+2ˆj−ˆk)2+1 →R=−13ˆi+43ˆj+13ˆk