CUET · MATHS · PYQ PAPER 2025
Assume P, Q, R and W are matrices of order \(3 \times 3, a \times 4, b \times c\) and \(d \times a\) respectively. If PQ + WR is well is well defined, find the value of ab + cd
- A 18
- B 28
- C 21
- D 13
Answer & Solution
Correct Answer
(C) 21
Step-by-step Solution
Detailed explanation
Order of P is \(3 \times 3\), Q is \(a \times 4\). For PQ to be defined: \(3 = a\). Order of W is \(d \times a\), R is \(b \times c\). For WR to be defined: \(a = b\). Given \(a = 3\), thus \(b = 3\). Order of PQ is \(3 \times 4\). Order of WR is \(d \times c\). For PQ + WR to…
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