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2014-08-05T11:15:20+03:00
100<  3^{n} <1000

3¹=3<100
3²=9<100
3³=27<100
3⁴=81<100
3⁵=243
3⁶=729
3⁷=2187 >1000

=> n∈{5,6}
1 5 1