(i) Express 49 as the sum of 7 odd numbers. 

(ii) Express 121 as the sum of 11 odd numbers.

(i)

We know that,

7²= 49

So, 49 can be expressed as sum of 7 consecutive odd numbers.

49 = 1 + 3 + 5 + 7 + 9 + 11 + 13

(ii)

We know that,

11²= 121

So, 121 can be expressed as sum of 11 consecutive odd numbers.

121 = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21