Ming found the least common multiple (lcm) of 8r2st3 and 10rs3t2 to be 40r2s3t2 by using these steps: step 1: lcm of 8 and 10 is 40 step 2: greatest power between r2 and r is r2 step 3: greatest power between s and s3 is s3 step 4: greatest power between t3 and t2 is t2 in which step did ming make a mistake?