2.2 Powers of 3 (25 points) Given a positive integer n, write a function that find the largest power of 3 less than n. That is, find the largest number less than n that can be expressed as 3* for some k. Write your answer as a example, largest-pox.3(30) should return 27 (3 27) Python function largest pow.3(n). For and largest pow.3 (300) should return 243 (3 Do not use the Python math module. 243)