O urna contine bile numerotate de la 1 la 27. Se extrage la intamplare o bila; se considera castigator Mihai, daca iese o bila numerotata cu un numar prim , respectiv Andrei daca iese o bila numerotata cu un patrat sau cub perfect. Care din cei doi copii are sanse mai mari de a castiga ?

Mihai

Step-by-step explanation:

2, 3, 5, 7, 11, 13, 17, 19, 23

avem 9 numere prime

P(Mihai) = 9×100/27 = 900/27 = 33,(3) %

1, 4, 9, 16, 25

Cuburi perfecte de la 1 la 27

1, 8, 27

avem 7 numere patrate si cuburi perfecte (1 se repeta)

P(Andrei) = 7×100/27 = 700/27 = 25,92 %

Observam ca Mihai are probabilitatea mai mare deci el este castigatorul

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.