This is the concept of probability and statistics, to solve the question we proceed as follows;
given that the word the word science has 7 letters;
the probability of selecting a c in the first draw will be:
P(selecting c in first draw)=2/7
Probability of selecting a c on the second draw will be:
P(selecting a c in second draw)=1/6
since these two events are mutually independent, the probability of selecting c twice will be:
P(selecting C twice)=1/6*2/7
=1/21
