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3^a - 5^b = 2
Find all integers
a
a
a
and
b
b
b
satisfying the equality
3
a
−
5
b
=
2
3^a - 5^b = 2
3
a
−
5
b
=
2
.(I. Gorodnin)
smallest no of acute angles by 30 lines
Thirty rays with the origin at the same point are constructed on a plane. Consider all angles between any two of these rays. Let
N
N
N
be the number of acute angles among these angles. Find the smallest possible value of
N
N
N
.(E. Barabanov)
1
8
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2
6
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3
6
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