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Descopera regula si apoi completeazaurmatorii doi termeni:

3, 7, 13, 27 ,53, 107, ....


Răspuns :

3+3+1=7
7+7-1=13
13+13+1=27
27+27-1=53
53+53+1=107
107+107-1=213
213+213+1=427