#### Question

Without adding find the sum 1 + 3 + 5 + 7 + 9

#### Solution

We know that the sum of first *n* odd natural numbers is n^{2}.

Here, we have to find the sum of first five odd natural numbers.

Therefore, 1 + 3 + 5 + 7 + 9 = (5)^{2} = 25

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Solution Without Adding Find the Sum 1 + 3 + 5 + 7 + 9 Concept: Some More Interesting Patterns.