Question

find the sum without adding 1+3+5+7​

Answer 1

Answer:

as they are odd numbers

so use the formula,

sum of first 4odd numbers

=n^2

=4^2

=16

Answer 2

Answer:

4² = 16

Step-by-step explanation:

Sum of first 'n' number of odd numbers equals to the the square of 'n'.

For example: Sum of of first six odd numbers equals to 36 which is the square of six.

1+3+5+7+9+11 = 36 = 6²

Similarly, sum of first 4 odd numbers equals to square of 4 which is 16.

1+3+5+7 = 4² = 16