ANSWERS - ODD MAN OUT

1. C . -1, -3, -5, -7, -9, -11 So replace 42 by 40
2. B, difference are 1², 2², 3², 4², 5², 6² So 5 to replace 6
3. B , no other term is a perfect square
4. A, differences are +2, +3, +4, +5, +6, +7  So 2 to replace 1
5. C , Only 3 is prime number
6. B, 2³-1, 3³-1, ….8³-1 So 26 to replace 28
7. D, 1²+1, 2²+1, 3²+1, 4²+1, ……. 7²+1 -à 17 to replace 18
8. E, All others are prime numbers. 31 to replace 33
9. C, (94-2)/2=46, (46-2)/2=22, (22-2)/2 = 10
10. C, 100-1²=99, 99-2²=95, 95-3²=32, 86-4²=70, 70-5²=45, 45-6²=9 So 10 to be replaced by 9

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