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completeaza urmatoarele siruri, respectand regula de formare a) 2,4,..., 18,20. b) 3,6,...15, 18 c)1,4,7...,22,25 d) 30,25,...5,0.

Răspuns :

a) 2,4,6,8,10,12,14,16,18,20.
b)3,6,9,12,15.
c) 1,4,7,10,13,16,19,22,25.
d) 30,25,20,15,10,5,0.