Arithmatical - Odd Man Out and Series

DIRECTIONS : Find out the wrong number in the series
1. 125, 106, 88, 76, 65, 58, 53
  A.  125
  B.  106
  C.  88
  D.  76
Solution
88.
Go on subtracting prime numbers 19, 17, 13, 11, 7, 5 from the numbers to get the next number. So, 88 is wrong.
2. 5, 15, 30, 135, 405, 1215, 3645
  A.  3645
  B.  1215
  C.  405
  D.  30
Solution
30.
Multiplly each term by 3 to obtain the next term. Hence, 30 is a wong number.
3. 3, 8, 15, 24, 34, 48, 63
  A.  15
  B.  24
  C.  34
  D.  48
Solution
34.
The difference between consecutive terms are respectively 5, 7, 9, 11 and 13. So, 34 is wrong.
4. 3, 4 , 10 , 32 , 136 , 685 , 4116
  A.  32
  B.  136
  C.  685
  D.  4116
Solution
136.
3*1+1=4, 4*2+2=10, 10*3+3=33, 33*4+4=136.
5. 1, 1, 2, 6, 24, 96, 720
  A.  720
  B.  96
  C.  24
  D.  6
Solution
96.
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