Arithmatical - Odd Man Out and Series

DIRECTIONS : Insert the missing number
6. 9, 12, 11, 14, 13, ..., 15
  A.   12 B.   16
  C.   10 D.   17
Solution
16.
Alternately we add 3 and subtract 1.
7. 1, 2, 4, 8, 16, 32, 64, ..., 256
  A.   128 B.   148
  C.   154 D.   164
Solution
128.
Each Previous number is multiplied by 2.
8. 165, 195, 255, 285, 345, ...
  A.   375 B.   420
  C.   435 D.   390
Solution
435.
Each number is multiplied by a prime number i.e., 15x11, 15x13, 15x17 ... So, the next number is 15x29=435.
9. 3, 4, 7, 16, 43, 124, ...
  A.   367 B.   356
  C.   125 D.   1222
Solution
367.
Each successive no. is obtained by first multiplying the previous by 3 and then subtracting 5.
10. 3, 7, 6, 5, 9, 3, 12, 1, 15, ...
  A.   18 B.   13
  C.   -1 D.   3
Solution
-1.
There are two series, beginning respectively with 3 and 7. In one 3 is added and in another 2 is subtracted. The next number is
1 - 2 = -1.
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