The answer
Map the row number (X) to the star count (Y). Find the difference between Y values (the slope), and use basic algebra (y = mx + b) to find the formula.
Using Mathematical Formulas to Control Loop Bounds
How do I find the mathematical relationship in a pattern?
More FAQs in Using Mathematical Formulas to Control Loop Bounds
The formula is (2 * row) - 1, assuming your row counter starts at 1.
The formula is exactly 2 * row, which prints 2, 4, 6, 8 stars progressively.
Using mathematical bounds inside the for-loop condition is cleaner, much faster, and scales perfectly for any value of N, unlike hardcoded if-statements.
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