Science Quiz / Math: Sometimes, Always, Never

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Can you name the validity (sometimes, always, or never) of each statement below? See 'How to Play' for assumptions.

Quiz Updated Feb 10, 2015

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StatementS/A/NExtra
for odds n and m, n*m is even
if x^2=1, then x=1
if x! = 1, then x=0
x^0=0
if x+y = z+y, then x=z
if x*y < 0, then x<0 or y<0
for x,y>0, if x/y < 1, then x < y
x*y > x+y
for prime p, p*x is also prime
for x,y ≠ 0, if x = 2*y, then x is even
for primes p,q,r, p*q*r+1 is prime
the sum of the interior angles of a triangle (Euclidean geometry) is 180º
if odd prime p = x^2 + y^2, then p ≡ 1 (mod 4)
for x,y,z ≠ 0 and n > 2, x^n + y^n = z^n
for prime p, x^p - x is divisible by p

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