Element - ∆ƈ - n Pick r (npr)

Characters: ∆, ƈ

Description

Get the number of combinations of r items from a set of n items

Overloads

• num-num - n_pick_r(a, b)
• num-str - n_pick_r(a, len(b))
• str-num - n_pick_r(len(a), b)
• str-str - n_pick_r(len(a), len(b))

Examples

• ⟨3|4|5|6⟩ ⟨1|2|3|4⟩ ∆ƈ = ⟨3|12|60|360⟩
• ⟨3|4|`12345`|`123456`⟩ ⟨1|`12`|3|`1234`⟩ ∆ƈ = ⟨3|12|60|360⟩