Study the given pattern carefully and select the number that can replace the question mark (?) in it.
| 4 | 10 | 9 |
| 5 | 13 | 13 |
| 7 | 19 | ? |
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 21.
The logic used here is:
Column 1:
2(5 - 4) = 2
7 - 5 = 2
Column 2:
2(13 - 10) = 6
19 - 13 = 6
Column 3:
2(13 - 9) = 8
x - 13 = 8
x = 21