Question

Which of the following is not a set of letters of word PRINCIPAL?

(a) {P,R,I,N,C,A,L}

(b) {C,A,P,I,N,R,L}

(c) {P,R,I,N,C,I,P,A,L}

(d) {L,N,I,P,C,A,R}

This question was posed to me during an interview.

My doubt is from Sets and their Representations topic in division Sets of Mathematics – Class 11

Answer 1

The correct choice is (c) {P,R,I,N,C,I,P,A,L}

To explain: A set has all unique elements. So the set which contain all the elements of word PRINCIPAL and no letter is repeated. Hence, {P,R,I,N,C,I,P,A,L} cannot be a set.