Question

Scrie sirul numerelor pare de la 42 la 368 . Cate cifre se folosesc pentru scrierea intregului sir?

Answer 1

42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, = 29 nr. * 2 = 58 cifre
100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198 = 50 nr. * 3 cifre = 150 cifre
200, 202, 204.............298 = 50 nr. * 3 cifre = 150 cifre
300, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 326, 328, 330, 332, 334, 336, 338, 340, 342, 344, 346, 348, 350, 352, 354, 356, 358, 360, 362, 364, 366, 368 = 35 nr. * 3 cifre = 105 cifre
58 + 150 + 150 + 105 = 463 cifre