Arithmatical - Odd Man Out and Series

DIRECTIONS : Find the odd man out :
6. 25, 49, 81, 121, 144, 169
  A.  49
  B.  121
  C.  144
  D.  169
Solution
144.
Each of the numbers except 144 is a perfect square.
7. 4, 16, 25, 36, 42, 64
  A.  36
  B.  25
  C.  42
  D.  95
Solution
42.
The Pattern is 2² ,4², 5², 6², 7², 8². But instead of 7², it is 49, which is to be turned out.
8. 385, 462, 572, 427, 671, 264
  A.  385
  B.  427
  C.  671
  D.  264
Solution
427.
In each number except 427, the middle digit is the sum of the other two.
9. 253, 136, 352, 324, 631, 244
  A.  324
  B.  136
  C.  352
  D.  631
Solution
324.
The Sum of the digits in each number, Except 324 is 10.
10. 2, 5, 10, 17, 26, 37, 50, 64
  A.  50
  B.  26
  C.  64
  D.  37
Solution
64.
The Pattern is x²+1 , where x=1 ,2 ,3 ,4 ,5 ,6 ,7 ,8 etc. But 64 is out of Pattern.
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