Discussion
Find the missing number in the matrix given below :
| 51 | 11 | 61 |
| 64 | 30 | 32 |
| 35 | ? | 43 |
Answer: B
The missing number is 27.
In each row, the middle number is the sum of the products of the digits of the two outer numbers:
- Row 1: 51 gives 5 × 1 = 5 and 61 gives 6 × 1 = 6; 5 + 6 = 11.
- Row 2: 64 gives 24 and 32 gives 6; 24 + 6 = 30.
- Row 3: 35 gives 15 and 43 gives 12; 15 + 12 = 27.
The rule fits the first two rows exactly, and only 27 completes the third, so 25, 32 and 37 are ruled out.
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