Odd Man Out and Series
 835, 734, 642, 751, 853, 981, 532 ?

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The difference of third and first digit is the middle one .
Correct Option: A
In each number except 751, the difference of third and first digit is the middle one .
 8, 27, 64, 100, 125, 216, 343 ?

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The pattern is 2^{3}, 3^{3}, 4^{3}, 5^{3}, 6^{3}, 7^{3} .
Correct Option: B
The pattern is 2^{3}, 3^{3}, 4^{3}, 5^{3}, 6^{3}, 7^{3}.
But 100 is not a perfect cube
 1, 4, 9, 16, 20, 36, 49 ?

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The pattern is 1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2}, 6^{2}, 7^{2} .
Correct Option: C
The pattern is 1^{2}, 2^{2}, 3^{2}, 4^{2}, 5^{2}, 6^{2}, 7^{2} .
But, instead of 5^{2}, It is 20, which is to be turned out.
 10, 25, 45, 54, 60, 75, 80 ?

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Each of the number except 54, is a multiple of 5.
Correct Option: C
Each of the number except 54, is a multiple of 5.
 16, 25, 36, 72, 144, 196, 225 ?

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Each of the number except 72, is a perfect square.
Correct Option: B
Each of the number except 72, is a perfect square.