+302 Question 1) How many positive five-digit integers contain the digit grouping "24" at least once? For instance, 24380 and 24440 are two such integers to include, but 23480 and 42034 do not meet the restrictions.
Question 2) For how many positive values of n are both \(n\over2\) and 3n four-digit base 9 integers?
+21 1. Do this: \(\text{There are 5 available options: xxxxx.} \\\text{These are the possible combinations: 24xxx, x24xx, xx24x, and xxx24} \\\text{it follows that: } \\10\cdot10\cdot10=1000\\ 9\cdot10\cdot10-1=899\\ 9\cdot10\cdot10-1=899\\ 9\cdot10\cdot10-2=898\\ \text{The answer is } 3696\)
+302 That is not the correct answer, can you check your explanation again please? Thank you
