Cevaplar

2012-10-19T01:12:31+03:00

s(AUB)=s(A)+s(B)- s(AnB)

4x-6=12+x+3x-8-(x-7)

4x-6=3x+11

x=17

s(AnB)=x-7=17-7=10

 

C(10,2)= 10! /(10-2)!2!

           =10!/8!.2!

           =10.9/2

           =45 olur

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