other Maths Puzzle Numerical Ability

Let C=(1976^1976-1974^1974)(1976^1975+1974^1973). A is equal to the sum of last 4 digits of C. Calculate A.

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What is the last digit of 6^5^4^3^2^1+5^4^3^2^1+4^3^2^1+3^2^1+2^1+1 N is an even 3-digit number such that the last 3 digits of N^2 are N itself. What is the value of N?