MATHCOUNTS Problems 205 and 201 SOLVE EITHER ONE, SOLVE BOTH AND I'LL BEST IT!

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205) What is the value of 1^2 – 2^2 + 3^2 – 4^2 + … + 99^2 – 100^2?

201) If a, b, c and d are positive integers such that a^b×c^d = 2^10 × 7^9, what is the least possible value of a + b + c + d ?

May 3rd, 2015

205. 50*(-2) = -100.

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May 3rd, 2015

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