Find the answer without actual addition of 1 + 3 + 5 + 7 + 9 + 11
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Answered by
1
1 + 3 + 5 + 7 + 9 + 11
It shows the sum of 6 odd naturals numbers.
Sum of n odd natural numbers (startin from 1) = n²
So 1 + 3 + 5 + 7 + 9 + 11 = 6² = 36
Answered by
0
firstly count the digits
digits=6
then do square
i:e: 36
thus the sum is 36
other method could be
take last digit
i:e: 11
now add 1 to it
i:e: 12
now do half of it
i:e:6
now do square
=36
thus the answer is 36
digits=6
then do square
i:e: 36
thus the sum is 36
other method could be
take last digit
i:e: 11
now add 1 to it
i:e: 12
now do half of it
i:e:6
now do square
=36
thus the answer is 36
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