(i) Express 81 as the sum of 9 odd numbers.
(ii) Express 100 as the sum of 10 odd numbers

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Solution

(i)81= $(9)^{2}$ = 1+3+5+7+9+11+13+15+17
(sum of first 10 odd numbers)
(ii)100= $(10)^{2}$ = 1+3+5+7+9+11+13+15+17+19
(sum of first 10 odd numbers)

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