Question

afla cardinalul multimi A= {xєNIx=abc barat,b=a+1,c=b+1}

Answer 1

abc=?
b=a+1
c=b+1
a={1,2,3,4,5,6,7}

1.b=1+1
b=2
c=2+1
c=3

2.b=2+1
b=3
c=3+1
c=4

3.b=4+1
b=5
c=5+1
c=6

4.b=6+1
b=7
c=7+1
c=8

A={123,234,456,678}
card A=4