Question

The probability of choosing a 6 at random from a standard deck of playing cards is 1/13 what is the complement of the event of choosing a 6

Answer 1

to find the complement of an event you have to figure out what the probability is of not choosing a 6 
since 1/13 is the probability that 6 is going to be choosen. 
the other 12/13 is used for every other card accept for the 6:)
hope this is right
have a good one:)

merry Christmas:)