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a ve b sayılarının aritmetik ortalaması 10, a,b ve c sayılarının aritmetik ortalaması 15 olduğuna göre,c kaçtır?

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894rans

a+b/2=10

a+b+c/3=15

a+b=20

a+b+c=45

c=45-20=25

10x2=20 15x3=45 45-20=25=c

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