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a)2ⁿ<70
b)25≤5ⁿ<1000


Răspuns :

2ⁿ<70
n∈{0,1,2,3,4,5,6}

25≤5ⁿ<1000
5²≤5ⁿ≤5⁴
2≤n≤4
n∈{2,3,4}

O zi buna!