combination

n. the selection of r objects from among n objects without regard to the order in which the objects are selected. The number of combinations of n objects taken r at a time is often denoted as _nC_r. A combination is similar to a permutation but distinguished by the irrelevance of order.

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Psychology term of the day

January 26th 2025

chemotherapy

n. the use of chemical agents to treat diseases, particularly cancer, in which case it is contrasted with radiation therapy. —chemotherapeutic adj. —chemotherapist n.