Răspunsuri

2014-09-29T15:43:46+03:00
1,1,2,3,5,8,13,21,...  acesta este sirul lui Fibonacci

urm numar va fi
13+21=34
1,1,2,3,5,8,13,21,34, 

21+34=55
1,1,2,3,5,8,13,21,34,55

34+55=89
1,1,2,3,5,8,13,21,34,55, 89

55+89 = 144
1,1,2,3,5,8,13,21,34,55, 89, 144

144+89 = 233

1,1,2,3,5,8,13,21,34,55, 89, 144, 233
Deci al 13-lea nr e 233
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