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Mathematics
Mathematics
Problem
Let
P
P
P
be a
2
×
3
2\times 3
2
×
3
matrix,
Q
Q
Q
a
3
×
2
3\times 2
3
×
2
matrix,
R
R
R
a
2
×
3
2\times 3
2
×
3
matrix and
S
S
S
a
3
×
3
3\times 3
3
×
3
matrix. For which of the following pairs is the operation
P
+
Q
P+Q
P
+
Q
,
P
+
R
P+R
P
+
R
,
Q
+
S
Q+S
Q
+
S
or
R
+
S
R+S
R
+
S
defined? a)
R
+
S
R+S
R
+
S
b)
P
+
Q
P+Q
P
+
Q
c)
P
+
R
P+R
P
+
R
d)
Q
+
S
Q+S
Q
+
S
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