4 doesn't belong because it's an even number.
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31 because 3+4=7+4=11+4=15+4 does not equal 31
of course it is! just because its a negative number doesnt mean its not divisible. any number is divisble by itself and the answer is always 1. in this case the answer is negative 1 because the negative needs to appear with one of the answers
Take your pick: 15 is the only number which is a product of 2 primes (3*5). 63 is the only number that is the products of three odd primes (3*3*7) 8 is the only cube number (22) 50 is the only number that is not one less than a square number (15=42-1, 63 = 82-1, 8 = 32-1).
Numerical Answer48 does not belong, because the sequence is (double) then (add 3) and after 256 to 29, the last number should be 58.Spelling Answer2 does not belong, because the rest of the numbers include the letter E when you spell them out in English.
3, they are all squares, three is not.