Question
Without adding, find the sum: $1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 +17 + 19$
✓
Answer
We know that the sum of first n odd natural numbers = $n^2$
Therefore, $1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19$
$= 10^2$
$= 100$
Therefore, $1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19$
$= 10^2$
$= 100$
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