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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

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7.......................................................................
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find the last digit of (1^5+2^5+3^5+.............+99^5) Let C=(1976^1976-1974^1974)(1976^1975+1974^1973). A is equal to the sum of last 4 digits of C. Calculate A.