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2014-09-23T15:41:20+03:00
7+63=70
14+56=70
21+49=70
28+42=70
35+70=105
70x4=280
280+105=385
3 5 3
2014-09-23T15:45:02+03:00
7 * (1 + 2 + 3 +.........+ 10) * 10/2 = 7 * 11 * 5 = 77 * 5 = 385

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