Question

Aflati cardinalul multimi A={x apartine lui N | x < 2001 . Urgent va rog!!

Answer 1

   
A={0,1,2,3,4,...,1999,2000} ; card A = 2000-0+1=2001    B={1,2,3,4,5,...,1956,1957} ; card B = 1957-1+1=1957
C={4,5,6,7,8,9,10} ; card C = 10-4+1=7
D={3,4,5,6};card D=6-3+1=4
E={6,7,8,9,10,11,12,13,14} card E=14-6+1=9
F={2,3,4,5,...,2000,2001} ; card F = 2001-2+1=2000