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Both Hemiptera and Hymenoptera belong to Neoptera, and although their development differs, they show similarities in wing folding and sometimes mouthpart adaptation.
In a box there are 8 red, 7 blue, and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?
If 2 pens are drawn at random what is the probability that none of them is blue?
Two cards are drawn at random from a pack of 52 cards. What is the probability that either both are black or both are queens?
Two unbiased dice are rolled. What is the probability that the first die shows a composite number and the second die shows a prime number?