In a group of 30 students, the probability that at most 25 of them like to swim
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√(- 9 ) / (( 4 - 7 i ) - ( 6 - 6 i )) = 3 i / ( 4 - 7 i - 6 + 6 i ) =
= 3 i / ( - 2 - i ) = - 3 i / ( 2 + i ) =
= - 1 - 2 i
= 3 i / ( - 2 - i ) = - 3 i / ( 2 + i ) =
= - 1 - 2 i