book Maths Puzzle Numerical Ability

~K v ~ M / ~J v ~M

How do I tell if this is valid or invalid??

Read Solution (Total 0)

book Other Question

i do'u under stand the greater than an less than thing and also the graph i do't know who i get it
please tell me Two cards are dealt from a well-shuffled deck of 52 cards. What is the probability that both cards are aces, given that the first card is an ace? Help!