From the options given below, select the number that shall come in place of (?) in the given table:
| 5 | 9 | 8 | 7 |
| 8 | 6 | 9 | 10 |
| 7 | 13 | ? | 19 |
| 5 | 7 | 8 | 9 |
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 15
The complete columns show the rule: in each column the sum of the first three numbers is 4 times the number at the bottom.
Column 1: \(5+8+7=20=4\times5\)
Column 2: \(9+6+13=28=4\times7\)
Column 4: \(7+10+19=36=4\times9\)
Column 3: \(8+9+?=4\times8=32\), so \(?=15\)