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x 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
y 0 1 2 3 4 5 6 0 1 2 3 4 5 6 0 1 2 3
.........................................................................................
x 18 19 20 21 22 23 24 25 26 27 28 29 30 31
y 3 4 0 1 2 3 4 0 1 2 3 4 0 1
a)
m.z. x∈{0,7,14,20,25,30}
b)
Nieprawda
f(1)=1
f(x)+1≠f(x+1)
n.p.
f(17)+1 ≠ f(18)
c)
f(x)>3
dla x∈{4,5,6,11,12,13,19, 24, 29}