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JEEMAIN and NEET
>>
JEEMAIN PAST PAPERS
>>
2001
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Q)
If
→
a
=
ˆ
i
+
ˆ
j
+
t
ˆ
k
,
→
b
=
ˆ
i
+
2
ˆ
j
+
3
ˆ
k
, then the values of
′
t
′
for which
(
→
a
+
→
b
)
and
(
→
a
−
→
b
)
are perpendicular, are :
( A )
±
2
√
3
( B )
±
3
( C )
±
3
√
2
( D )
±
2
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