Pattern Recognition-78

Find out the missing number

10     3     6     4     5     11
4      13    ?     7     10     4


Answer

10     3     6     4     5     11                    (10+6)-3 = 13
4     13    ?     7     10     4

10    3     6    4     5     11                       (3+4) -6 =1
4     13    ?     7     10     4

10    3    6     4     5     11                       (6+5) -4 =7
4     13    ?    7     10     4

10    3     6     4     5     11                        (4+11) -5 =10
4     13   ?     7     10     4

10   3     6     4     5     11                        (5+10) -11=4
4     13   ?     7    10    4

Missing number = 1

There is another excellent answer from someone @ office.

"I have taken the numbers in blocks of four, two from each of the top and bottom lines moving from right to left and all four blocks total 30.

ie. 10, 3, 4 and 13 = 30
     6, 4, 13 and 7 =30
     5, 11, 10 and 4 =30. "

missing number = 13