The value of b such that scalar product of the vectors \[(\mathbf{i}+\mathbf{j}+\mathbf{k})\] with the unit vector parallel to the sum of the vectors \[(2\mathbf{i}+4\mathbf{j}-5\mathbf{k})\] and \[(b\mathbf{i}+2\mathbf{j}+3\mathbf{k})\] is 1, is [MNR 1992; Roorkee 1985, 95; Kurukshetra CEE 1998; UPSEAT 2000]

The value of b such that scalar product of the vectors \[(\mathbf{i}+\

1.	The value of b such that scalar product of the vectors \[(\mathbf{i}+\mathbf{j}+\mathbf{k})\] with the unit vector parallel to the sum of the vectors \[(2\mathbf{i}+4\mathbf{j}-5\mathbf{k})\] and \[(b\mathbf{i}+2\mathbf{j}+3\mathbf{k})\] is 1, is [MNR 1992; Roorkee 1985, 95; Kurukshetra CEE 1998; UPSEAT 2000]
A.	? 2
B.	? 1
C.	0
D.	1
Answer» E.

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