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2014-10-07T21:39:05+03:00
A) S = 1 + 3 + 5 + 7 +......+199 = 199 * (1 + 199) : 2 = 199 * 200 : 2 = 199 * 100 = 19900
b) S = 2 + 4 + 6 +..... + 800 = 2(1 + 2 + 3 + ....+ 400) = 2 * 400/2 * (1 +400) = 2 * 200 * 401 = 400 * 401 = 160 400 
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