List some keywords that refer to an exponential term

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

State if the two triangles are congruent. if they are, state how you know?

What dimensions can créate more than one triangle ?