Number Series Puzzles -14

1.  What number should replace the question mark ?
 
      24,30,?,60,84,114

A:-  42

       24
       24+6 = 30
       30+12 = 42
       42+18 = 60
       60+24 = 84
       84+30 = 114.

2.  What number should replace the question mark ?
  
     16,23,19,19,22,15,25,?

A:-  11

        16,23
        16+3 = 19
        23-4  = 19
        19+3 = 22
        19-4 = 15
        22+3 = 25
        15-4 = 11.

3.  What number should replace the question mark ?

      10,10,9,7,7,?,4,4,3,1.

A:- 6

      10,10
      10-1 = 9
      10-3 = 7

      7,7
      7-1 = 6
      7-3 = 4

     4,4
     4-1 = 3
     4-3 = 1

     1,1.

4.  Complete the sequence

     2,3,4,9,16,81,256,?

A:-  6561

       2,3
       2*2 = 4
       3*3 = 9
 
      4*4 = 16
      9*9 = 81

     16*16 = 256
     81*81 = 6561.