Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
--------
Question: Problem: 10 ^ ( 600 ) ã · 10 ^ ( 580 ) = ?
Options: a. 10 ^ 10, b. 10 ^ 20, c. 10 ^ 22, d. 10 ^ 23, e. 10 ^ 24

Answer: b


Question: Problem: a bag contains 21 toys numbered 1 to 21. a toy is drawn and then another toy is drawn without replacement. find the probability that both toys will show even numbers.
Options: a. 5 / 21, b. 9 / 42, c. 6 / 22, d. 4 / 21, e. 3 / 21

Answer: b


Question: Problem: little john had $ 7.10. he spent $ 1.05 on sweets and gave to his two friends $ 1.00 each. how much money was left ?
Options: a. $ 4.85, b. $ 4.15, c. $ 4.65, d. $ 4.55, e. $ 4.05

Answer:
e