Odd Man Out and Series
 2, 4, 12, 48, 240, (...) ?

 960
 1440
 1080
 1920

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Go on multiplying the given numbers by 2, 3, 4, 5, 6. So, the correct next number is 1440.
Correct Option: B
Go on multiplying the given numbers by 2, 3, 4, 5, 6. So, the correct next number is 1440.
 2, 6, 12, 20, 30, 42, 56, (...) ?

 60
 64
 72
 70

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The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8. So, the next number is 8 x 9 = 72.
Correct Option: C
The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8. So, the next number is 8 x 9 = 72.
 3, 7, 15, 39, 63, 127, 255, 511 ?

 7
 15
 39
 63

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Go on multiplying 2 and adding 1 to get the next number. So, 39 is wrong.
Correct Option: C
Go on multiplying 2 and adding 1 to get the next number. So, 39 is wrong.
 40960, 10240, 2560, 640, 200, 40, 10 ?

 640
 40
 200
 2560

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Go on dividing by 4 to get the next number. So, 200 is wrong.
Correct Option: C
Go on dividing by 4 to get the next number. So, 200 is wrong.
 1, 1, 2, 6, 24, 96, 720 ?

 720
 96
 24
 6

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Go on multiplying with 1, 2, 3, 4, 5, 6 to get the next number. So, 96 is wrong.
Correct Option: B
Go on multiplying with 1, 2, 3, 4, 5, 6 to get the next number. So, 96 is wrong.