September 2018 1 39 Report

Jeżeli n oznacza liczbę par (a,b) takich, że a∈{0, 1, 2, 3, 4, 5} i b∈{0, 1, 2, 3} i liczba
10a + b jest dwucyfrowa i parzysta, to

a n=5

b n=6

c n=10

d n=12


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