Answer :
If you see the pattern it's like
A * B = (A * B) - (A - 1)
For example
6 * 3 = (6 * 3) - (6 - 1) = 18 - 5 = 13
So the missing number will be calculated as,
19 * 11 = (19 * 11) - (19-1) = 209 - 18 = 191
So the missing number is 191
A * B = (A * B) - (A - 1)
For example
6 * 3 = (6 * 3) - (6 - 1) = 18 - 5 = 13
So the missing number will be calculated as,
19 * 11 = (19 * 11) - (19-1) = 209 - 18 = 191
So the missing number is 191
i think the missing no:is.........................................191