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2) 29-20+1 = 10 termeni
1/29 < 1/20 !/28 <1/20 ...........1/21 < 1/20 ⇒ S < 10·1/20 S < 1/2 ⇒ S < 2/3
1/20 > 1/21 > 1/22 > 1/23 >.........>1/29 S > 10·1/29 S > 10 /29 S >10/30 S >1/3