Question

the sum of 20 odd number is​

Answer 1

Step-by-step explanation:

The first number odd =1,3,5,7,9−37,39

Here,the first term is 1 and

Common dofference is 2

The series is in AP

∴Sn=2n×[a+(n−1)×1]

∴S20= 220[1+(20−1)×2]

∴S20=400

Answer 2

Answer:

The sum of first 20 odd natural numbers is 400.

Step-by-step explanation:

See the attached image