What are the first three terms of the sequence represented by the recursive formula

Volume of cylinder with a radius of 8cm and height of 25 cm

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Add the fractions and simplify 1/2+ 1/3