John puts the letters of the word science on pieces of paper and puts the pieces in a bag. he draws two letters without looking. the first piece of paper is not replaced before the second piece is drawn. what is the probability that john draws a c twice?

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
 

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a