Which of the 5 answers fits the grid, and what is the pattern?
- A. 13-21-18
- B. 10-18-19
- C. 12-20-19
- D. 11-22-15
- E. 19-19-19
The answer is given as C, but no explanation is given as to why C is correct.
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I tried various techniques, but only this seemed to make any sense to me
Each number should be written as the number of prime factors it has. This number is [1,2,3] in each row.
eg -> 5 has only 1 prime factor '5'. So replace 5 with 1. 12 has 3 prime factors (2,2,3). So replace 12 with 3. And so on.
Using this logic, we see that we need a number with 3 prime factors in first and second row and number with 1 prime factor in last row. Only 'c' satisfies our criteria