Question

Without adding find sum
| +3+5+7+9+1 1+13 + 15 + 17+19
.​

Answer 1

Answer:

As this is an continuous A.P. of odd natural number.

Sum of odd natural number = $\frac{10}{2}$(1 + 19)

                                                = 5 × 20

                                                = 100

Sum of odd natural number = n²

                                                = 10²

                                                = 100

where n = number of terms.

Answer 2

Answer:

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

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