Sum of first row = 4/11 + 9/11 + 2/11 = 5/11 [Given]
Sum of second row = 3/11 + 5/11 + 7/11 = 3+5+7/11 = 15/11
Sum of third row = 8/11 + 1/11 + 6/11 = 8+1+6/11 = 15/11
Sum of first column = 4/11 + 3/11 + 8/11 = 4+3+8/11 = 15/11
Sum of second column = 9/11 + 5/11 + 1/11 = 9+5+1/11 = 15/11
Sum of third column = 2/11 + 7/11 + 6/11 = 2+7+6/11 = 15/11
Sum of first diagonal (left to right) = 4/11+5/11+6/11/11 = 15/11
Sum of second diagonal (left to right) = 2/11+5/11+8/11/11 = 15/11

Since the sum of fractions in each row, in each column and along the diagonals are same,
therefore it is a magic square.

Exercise 2.1 Question 2, 3, 4

for more answers vist to:
https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-2/