Q. 5 A3.8( 14 Votes )
Express 81 as the
Answer :
We know that,
Sum of first n odd numbers = n2
Expressing 81 as a sum of 9 odd numbers
81 = (9)2
n = 9
81 = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17
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