self Maths Puzzle

There is a safe with a 5 digit number as the key.The 4th digit is 4 greater than second digit, while 3rd digit is 3 less than 2nd digit. The 1st digit is thrice the last digit.There are 3 pairs whose sum is 11.Find the number.

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self Other Question
The number in the unit's place when 17 is raised to the power of 173 is? In a Cricket match, each team had 11 members. Each member of a team shook hands with all other players of the
other team before the match and Shook hands with all players in other team as well as own team after the match. How many shake hands were there all together?