It is easy to guess that 51 is the missing number. The entries in the last row are obtained by taking multiplication of entries in third and second row and subtracting entries in first row in the same column. Is another idea possible to get another answer? 
Asked
Active
Viewed 30 times
0
user61681
- 420
1 Answers
3
If you view the middle column as the median of the other two, the last entry can be $49$.
Remark: Such questions are not properly phrased and it is hard to justify what is the answer.
Siong Thye Goh
- 149,520
- 20
- 88
- 149
-
Can one say that this is an example of an ill-posed problem? – rafa11111 Nov 27 '18 at 02:00
-
1hmm... i might need a definition of ill-posed problem to answer that. the question is too open ended. – Siong Thye Goh Nov 27 '18 at 02:04