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UKMT Senior Mathematical Challenge, 2009

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

What is the value of $1^6 - 2^5 + 3^4 - 4^3 + 5^2 - 6^1$ ?

(A) $1$ (B) $2$ (C) $3$ (D) $4$ (E) $5$

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