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BITSAT 2019 Slot 2 Solved Paper
Show Para
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Section:
Mathematics
© examsiri.com
Question :
144 of 150
Marks:
+1
,
-0
If
a
=
^
i
+
2
^
j
+
3
^
k
,
b
=
−
^
i
+
2
^
j
+
^
k
,
c
=
3
^
i
+
^
j
and
a
+
p
b
is normal to
c
, then
p
is equal to
0
1
5
3
Validate
Solution:
(
a
+
p
b
)
is normal to
c
∴
(
a
+
p
b
)
.
c
=
0
(
(
1
−
p
)
^
i
+
(
2
+
2
p
)
^
j
+
(
3
+
p
)
^
k
)
.
(
3
^
i
+
^
j
)
=
0
3
−
3
p
+
2
+
2
p
=
0
⇒
p
=
5
© examsiri.com
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