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Express the square of 11 in terms of sum of odd numbers.

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in Mathematics – Class 8 by (91.0k points)
Express the square of 11 in terms of sum of odd numbers.

(a) 1+3+5+7+9+11+13+15+17+19+21

(b) 1+2+3+5+7+9+11+13+15+17+19

(c) 1+3+5+7+9+11+13+15+17+21+23

(d) 1+2+3+4+5+6+7+8+9+10+11+12

I had been asked this question during an online interview.

I need to ask this question from Finding the Square of a Number topic in chapter Squares and Square Roots of Mathematics – Class 8

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Best answer
Right choice is (a) 1+3+5+7+9+11+13+15+17+19+21

Explanation: The correct option is the one with the first 11 odd numbers as the sum of first n odd numbers gives n^2. Hence the correct answer is the one with the first 11 odd number.

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