NTA Abhyas JEE Main2020MathematicsPermutation and CombinationPractice
The number of ordered pairs of positive integers a , b , such that their Least Common Multiple is the given positive integer 7 2 × 1 1 3 × 1 9 4 , is equal to
Correct answer
315
Step-by-step solution
Required number of ordered pairs = 2 × 2 + 1 2 × 3 + 1 2 × 4 + 1 = 5 × 7 × 9 = 315