Five letters are chosen from the word SINGAPURA.
Find the probability that the letters chosen can be used to form the word SINGA.
is it: . ? . . . . Yes!It is possible, but it takes more work . . .Is it possible to solve this question without using combination (nCr)?
(1) We can list the 126 possible 5-letter samples
. . . and then count the number that contain S,I,N,G,A (there are two).
(2) We could work out the probability like this.
Find the probability of getting S-I-N-G-A (in that order).
Since the order is unimportant, the probability is: .