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Nth Magical Number

Explore how to find the nth magical number, which is divisible by either of two given integers. Understand the problem constraints and learn to implement efficient solutions using modular arithmetic to handle large results. This lesson strengthens your math and coding skills for interview challenges.

Statement

Given three integers n, a, and b, return the nth magical number.

A magical number is defined as a positive integer that is divisible by either a or b.

As the result may be very large, return it modulo 109+710^9+7 ...