Question

without adding find the sum of the following number
a)1+3+5+7+9=
b)1+3+5+7+9+11+13+15+17=
c)1+3+5+7+9+11+13+15+17+19+21+23+25=​

Answer 1

Answer:

a) 1+3+5+7+9 = 5^2

b) 1+3+5+7+9+11+13+15+17 = 9^2

c) 1+3+5+7+9+11+13+15+17+19+21+23+25 = 13^2

Step-by-step explanation:

The square of a natural number n is equal to the sum of the first n odd numbers.

Answer 2

Step-by-step explanation:

• 1+3+5+7+9 = 25

${5}^{2} = 25$

• 1+3+5+7+9+11+13+15+17 = 81

${9}^{2} = 81$