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Problems
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Problems

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Difficulty
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559
Bicycle
Medium
561
Interesting equation
Very hard
563
Simple equation
Very easy
572
The Lesson of Mathematics
Very easy
575
Sequence
Very easy
576
Office
Very easy
577
Book
Very easy
582
Sequence-2
Easy
583
Airplane
Hard
596
Trade Agreements in Amber
Very easy
605
Beautiful results table
Medium
606
Scoreboard
Easy
614
Buying fruits
Medium
616
Radars
Very easy
617
Lotto
Easy
624
DVD
Hard
627
Unloved digits
Easy
631
Mondriaan's Dream
Very easy
634
Deposit "Anti-crisis"
Easy
637
City Festival
Very easy
638
Indivisibility of binomial coefficients
Easy
641
Number of quadratic residues
Easy
643
Triangular Room
Easy
646
Jumps on strip
Hard
649
Factorial and fourth degree
Hard
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