Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
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Correct Answers: 
1
Points: 
10

Calculate the number 5505

NUMBERMANIA: Calculate the number 5505 using numbers [9, 8, 7, 2, 49, 624] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
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Correct Answers: 
1
Points: 
10

Calculate axb

Look at the series (314, 412, a, 832, 848, b, 8480), determine the pattern, and calculate axb.
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Correct Answers: 
22
Points: 
8

Calculate the number 5660

NUMBERMANIA: Calculate the number 5660 using numbers [1, 9, 8, 2, 51, 516] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
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Correct Answers: 
1
Points: 
10

Decrypt the message

Category: 
Correct Answers: 
2
Points: 
9
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