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To calculate the number of combinations with repetition, where order is ignored and repetition is allowed, you use the formula $\binom{n+r-1}{r}$. This counts the number of ways to select $r$ objects from $n$ distinct types.

Conditions: Repetition is allowed.; Order does not matter.; There are $n$ distinct types of objects.; You are selecting exactly $r$ objects.

To calculate the number of combinations with repetition, where order is ignored and repetition is allowed, you use the formula $\binom{n+r-1}{r}$. This counts the number of ways to select $r$ objects from $n$ distinct types.

Conditions: Repetition is allowed.; Order does not matter.; There are $n$ distinct types of objects.; You are selecting exactly $r$ objects.