Olympiad workbookIOQMPermutation and Combination
Let n=2 ¹⁹ 3¹² . Let M denote the number of positive divisors of n^2 which are less than n but would not divide n . What is the number formed by taking the last two digits of M (in the same order)?
Correct answer
28
Step-by-step solution
n^2=2³⁸ 3²⁴ Required number of divisors aligned & = (38+1)(24+1)+1 2 -20 13 & =228 & 28 aligned