Question

Without actual addition find the sum 1+3+5+7+9+11+13+15+17

Answer 1

We have to find the sum of above series without actual addition

The given series is 1+3+5+7+9+11+13+15+17

The series is in the form of AP with a=1, d=2 and n=50 and last term l=17

Sum of series = n2∗ (a + l)

= 9/2 ∗ (1+17)

= 4.5*18

=81

Therefore, answer: - the sum 1+3+5+7+9+11+13+15+17 is 81.

Answer 2

$\huge Hello$$\huge friends,$

Sum of series = n2 (a+I)

⏩9/2 (1+17)

⏩4.5*18

⏩81

$\huge BeBrainly$

$\huge @techybhai$

Answer 3

$\huge Hello$$\huge friends,$

Sum of series = n2

⏩9/2*(1+17)

⏩4.5*18

⏩81

$\huge BeBrainly$

$\huge @techybhai$