INSTRUCTIONS You hand your friend a letter to mail. The probability that your friend forgets to send the letter is 0.2, the probability that the post office does not deliver a

letter is 0.005, the probability that the recipient is on vacation and does not receive letters is 0.1. Use a tree diagram, and calculate the probability that your friend forgot to send the letter if it is known that the recipient did not receive your letter. Provide handwritten solution for it