Question

without adding, find the sum of the following number. 1 ) 1+3+7+9= 2) 1+3+5+7+9+11+13+15+17= 3)1+3+5+7+9+11+13+15+17+19+21+23+25=​

Answer 1

Answer:

[1] 20

[2] 81

[3] 169

Step-by-step explanation:

[1] 1+3+7+9=20

[2] 1+3+5+7+9+11+13+15+17=81

[3]  1+3+5+7+9+11+13+15+17+19+21+23+25=169

Answer 2

1) 20
2) 81
3)169


Hope it helped