xy ve yx iki basamaklı doğal sayılardır.
xy = (2a-1) - (x + y)
yx = (3a + 2) - (x + y)
=
.
olduğuna göre, x y çarpımı kaçtır?
A) 14
B) 15
C) 16
D) 18
E) 21
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