Find the missing number?
1,1,3,4,5,9, 7, 16, 9, 25, 11, ? 

Select the letter-pair that can replace the question mark (?) in. the following series
BA, DC, FE, HG, ? , LK

Study the given pattern carefully and select the number that can replace the question mark (?) in it.

Find the missing number?

19 ( 36 ) 13 and 37 ( 81 ) 28, then what is the value of A in 43 ( A ) 38.

Select the missing number from the options given below.

Find the missing number?
1, 2, 4, 6, 10, 12, ____

Find the missing number?