Question

Every student should take 9 triangular sheets of paper and one plate. Numbers from 1 to 9 should, be written on each triangle. Everyone should keep some numbered triangles in the plate. Now the triangles in each plate form a subset of the set of numbers from 1 to 9.

Look at the plates of Sujata, Hameed, Mukta, Nandini, Joseph with the numbered triangles. Guess the thinking behind selecting these numbers. Hence write the subsets in set builder form.

Answer 1

Sujata:

S = {x | x = 2n- 1, n ∈ N, x < 9} 

Hameed: 

H = {x | x = 2n, n ∈ N, x < 9} 

Mukta: 

M = {x | x = n² , n ∈ N, x ≤ 9} 

Nandini:

N = {x | x ∈ N, x ≤ 9} 

Joseph: 

J = {x | x is a prime number between 1 and 9}