Question

Without adding find the sum
1 + 3 + 5 + 7 + ..... + 23 = ?​

Answer 1

Answer:

144

Step-by-step explanation:

its formula of summetion if ap where

sum=(n/2)×(a+l)

where n is no. of terms,a is first term; l is last term

thus ; sum=(12/2)×(1+23)

or 6×24

Thus sum = 144

Answer 2

144 will be sum...

.....