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scrieti elementele multimilor
a)= {x) x
∈N, x=2k+1,k∈N,k ≤3)


Răspuns :

k={0,1,2,3}
2*0+1=1
2*1+1=3
2*2+1=5
2*3+1=7
x={1,3,5,7}