Question 90

Solve the following question:

Express 81 as the sum of first nine consecutive odd numbers.

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Solution

$81 = (9)^{2} = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17$
= Sum of first nine consecutive odd numbers.

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Question 90

Solve the following question:

Express 81 as the sum of first nine consecutive odd numbers.

15^{3}

11^{3}

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

9^{3}

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