(i) We know that the sum of first 'n' odd natural numbers is equal to
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n2
Now first 7 odd natural numbers are added,
Therefore, 1 + 3 + 5 + 7 + 9 +11+13 = 72 = 49
(ii) We know that the sum of first 'n' odd natural numbers is equal to
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n2
Now first 16 odd natural numbers are added,
Therefore, 1 + 3 + 5 + 7 + 9 +11+13+15+17+19+21+23+25+27+29+31 = 162 = 256