Question

Observe the following patterns. Then find the sum of 1+3+5+7+9+ ……+19.
1 = 1 x 1 = 1
1+3 = 2 x 2 = 4
1+3+5 = 3 x 3 = 9
1+3+5+7 = 4 x 4 = 16
1+3+5+7+9 = 5 x 5 = 25

Answer 1

Answer:

100

Step-by-step explanation:

As 1 = 1 x 1 = 1

1+3 = 2 x 2 = 4

1+3+5 = 3 x 3 = 9

1+3+5+7 = 4 x 4 = 16

1+3+5+7+9 = 5 x 5 = 25

Therefore , 1+3+5+7+....+19=10*10=100