Answer:
(i) 1 + 3 + 5 + 7 + 9 = sum of first five odd natural numbers = 52 = 25 (ii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = sum of first ten odd natural numbers = 102 = 100 (iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 = sum of first twelve odd natural numbers \[={{12}^{2}}=144\].
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