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Let ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ = 1 3 9 0 1 3 0 0 1 P and Q = [q ij ] be two 3 × 3 matrices such that Q – P 5 = I 3 . Then 32 31 21 q q q + is equal to :

1. 15
2. 9
3. 135
4. 10

Correct answer: 10

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