Solveit

but what i found then ? :(

independent it is mean: Tom or John will pass the exam not both 

T-   3/10

J-    4/10 

the probability that they will pass is 3/10+4/10=7/10=0.7

the probability that they will both pass is 3/10x4/10=12/100=0.12

0,7-0.12=0.58 (D)

just a stupid question or my answer is wrong

i found 0.58 answer

yea :D

my finger look like a good guy

Thanks Guest and CPhill !

your equation is wrong may be you forget smth

infinity

1000^1000     is   ( 10^3 )^1000  = 10^3000

Thanks Guest :))