Functions for GCD, LCM and LCD.

• Math.gcd(...nums) - returns greatest common divisor/factor of given numbers
• Math.lcm(...nums) - returns least/lowest common multiple of given numbers
• Math.lcd(...nums) - returns lowest/least common denominator of given numbers

Math.gcd(48,18,30)
// 6

Math.lcm(4,6,8)
// 24

Math.lcd(3,4,6)
// 12