How many ways are there of choosing 5 objects, without replacement, from 15 distinct objects, ifthe order of the choices is not taken into consideration?the order of the choices is taken into consideration?

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.