Odd Man Out and Series
 2, 5, 10, 17, 26, 37, 50, 64 ?

 50
 26
 37
 64

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The pattern is x^{2} + 1, where x = 1, 2, 3, 4, 5, 6, 7, 8 etc.
Correct Option: D
The pattern is x^{2} + 1, where x = 1, 2, 3, 4, 5, 6, 7, 8 etc. But 64 is out of pattern
 331, 482, 551, 263, 383, 242, 111 ?

 263
 383
 242
 111

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The product of first and third digit is the middle one.
Correct Option: B
In each number except 383, the product of first and third digit is the middle one.
 1, 2, 6, 15, 31, 56, 91 ?

 31
 91
 56
 15

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Add 1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2}, 6^{2} .
Correct Option: B
Add 1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2},6^{2} .
So, 91 is wrong.
 25, 36, 49, 81, 121, 169, 225 ?

 36
 49
 121
 169

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The number are square of odd natural numbers, starting from 5 up to 15.
Correct Option: A
The number are square of odd natural numbers, starting from 5 up to 15. So, 36 is wrong.
 56, 72, 90, 110, 132, 150 ?

 72
 110
 132
 150

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The number are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13 .
Correct Option: D
The number are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13 . So, 150 is wrong.