Given that 
0
a b
 
rr 
 and 
0
a
×b
r=
r
r What can you conclude about the vectors
aand
rb
r 7 Let the vectors 
, ,
a b c
rr
r  be given as 
1
2
3
1
2
3
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
,
,
a i
a j
a k b i
b j
b k
+
+
+
+
1
2
3 ˆ
ˆ
ˆ
c i
c j
c k
+
+