Question
Without adding, find the sum:
$(1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19)$
$(1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19)$
✓
Answer
Sum of first 10 odd numbers $= 10^2 = 100$.
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