From a Group of Seven Finalists to a Contest, Three

question 112

Short Answer

From a group of seven finalists to a contest, three individuals are to be selected for the first and second and third places. Determine the number of possible selections.

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Definitions:

Isotope

Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number, but share the same number of protons.

Electrons

Negatively charged particles within atoms, essential for conducting electricity in solid materials.

Iron

A metal element with the symbol Fe, known for its magnetic properties and widely used in construction, manufacturing, and biochemistry.

Isotope

Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.