The nth term of a sequence in 2n-1 The nth term of a different sequence is 3n+1

Work three numbers that are in both sequences between 20 and 40
Write the numbers in a single line

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.