self Maths Puzzle

The number in the unit's place when 17 is raised to the power of 173 is?

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self Other Question

Alex and John can separately do a piece of work in 14 and 11 days each. They start working together on this and later, John leaves. After this, Alex completes the work in 8 days. For how many days did Jonh work? 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.