The least common multiple of 9, 8 and 6 is:
9X8X6÷3= 144 people
144- 1= 143 people
A: At least 143 people participated in the competition.
Least common multiple method;
(1) Multiply these two common prime factors by their unique prime factors by decomposing the prime factors.
(2) In the form of short division.
(3) Special case: If two numbers are prime numbers, then the product of these two numbers is their least common multiple.
If the larger number of two numbers is a multiple of the smaller number, the larger number is the least common multiple of the two numbers.