Question

Fie multimile: A={x e N|0 < x la puterea 3 < sau = 124} si B={y e N*| y= x la puterea 2 -1, x e A. Determinati elementele celor doua multimi si precizati cate submultimi are multimea B.

Answer 1

A = {1,2,3,4}

y=1²-1=1-1=0
y=2²-1=4-1=3
y=3²-1=9-1=8
y=4²-1=16-1=15
B = {3,8,15}
Submultimi B : ∅, {3} ; {8} ; {15} ; {3,8}; {3;15}; {8;15}; {3,8,15}
8 submultimi