Question

Without adding, write the sum of first 10 odd numbers. ​

Answer 1

Answer:

the sum of first 10 odd numbers is 25

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Answer 2

Answer:

sum of n odd natural numbers = square of the number of terms

so, 10 odd numbers sum means 10 terms =100 is the sum

proof - 1+3+5+7+9+11+13+15+17+19=100