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QUESTION
Q
If a = 2, b = 3, then (ab + ba)−1 is
If a = 2, b = 3, then (ab + ba)−1 is
A
1/27
B
1/13
C
1/21
D
1/31
E
1/17
A
1/27
B
1/13
C
1/21
D
1/31
E
1/17
Solution
(ab + ba)−1 = (23 +32)−1
= (8 + 9)−1
= (17)−1
= 1/17
(ab + ba)−1 = (23 +32)−1
= (8 + 9)−1
= (17)−1
= 1/17
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