Question

without adding, find the sum of 1+3+5+7+9+11+13+15+17+19 and write in terms of squares​

Answer 1

Step-by-step explanation:

1=2×1-1

3=2×2-1 and so on

nth term resembles 2n-1

1=1²-0²

3=2²-1²

5=3²-2²

7=4²-3² and so on

19=10²-9²

sum = 1²+2²-1²+3²-2²+......+10²-9²= 10²=100

Answer 2

Answer:

1+3+5+7+9+11+13+15+17+19=10²

Step-by-step explanation:

the sum of first ten odd number =10² or 100