NCERT Exercise 1.3 Q1 - Sets
Question: Fill in subset or not-a-subset for: (i) {2,3,4} and {1,2,3,4,5}; (ii) {a,b,c} and {b,c,d}; (iii) Class XI students and all students of the school; (iv) circles in a plane and circles in that plane of radius 1; (v) triangles in a plane and rectangles in the plane; (vi) equilateral triangles and triangles; (vii) even natural numbers and integers.
Answer: (i) subset; (ii) not a subset; (iii) subset; (iv) not a subset; (v) not a subset; (vi) subset; (vii) subset.
Full step-by-step NCERT solution with diagrams on Something by Zero.