Răspunsuri

2014-07-31T20:59:55+03:00
6 divizibil cu n-1 ⇒ n-1 = {1,2,3,6}
n-1=1 ⇒ n=2
n-1=2⇒ n=3
n-1=3⇒ n=4
n-1=6⇒ n=7
A={2,3,4,7}

2k+1≤7⇒ 2k≤6⇒ k≤3
B={0,1,2,3}

b. A reunit cu B={0,1,2,3, 4, 7}
    A  intersectat cu B={2,3}
   A-B={4,7}