Without adding, find the sum
(i) 1 + 3 + 5 + 7 + 9
(ii) 1 + 3 + 5 + 7 + 9 + I1 + 13 + 15 + 17 +19
(iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23
(i) As per the question, we have to find the sum of first five odd natural numbers.
Therefore,
1 + 3 + 5 + 7 + 9
= (5)2
= 25
(ii) As per the question, we have to find the sum of first ten odd natural numbers
Therefore,
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19
= (10)2
= 100
(iii) As per the question, we have to calculate the sum of first twelve odd natural numbers
Therefore,
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 +17 + 19 + 21 + 23
= (12)2
= 144