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P,Q and R are three points with position...

P,Q and R are three points with position vector i + j , i - j and ai +bj +ck respectively. if P,Q,R are collinear then

A

a = b = c = 1

B

a = b = c = 0

C

a= 1 and b,c `in`R

D

a = 1,b`in`R, c = 0

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The correct Answer is:
A
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