As per Article 170 of the Constitution of India,

Article 170 – Composition of Legislative Assemblies:
It lays down the minimum and maximum strength of the Legislative Assembly in each state.
Minimum: 60 members.
Maximum: 500 members.
Exception: Smaller states like Goa, Mizoram, and Sikkim are allowed to have fewer than 60 members due to their population size.
Purpose:
To ensure adequate representation of the people in proportion to the population of the state.
The number of seats is determined by the population census and adjusted through delimitation exercises.
Key Point:
While the Constitution sets the range (60–500), the actual strength varies by state depending on its population.
For example:
Uttar Pradesh has 403 MLAs.
Sikkim has 32 MLAs (special exception).
Goa has 40 MLAs (special exception).
In short: Article 170 specifies that a State Legislative Assembly must have not less than 60 and not more than 500 members, with exceptions for smaller states.