Question

the sum of first 20 odd number is 600 500 400 484​

Answer 1

400 is answer

First 20 odd natural numbers:

First term, a=1

Common difference, d=2

Sum of first n terms of and AP:

2

n

(2a+(n−1)d)

Here, n=20,a=1,d=2

Substituting these, we get

Sum of first 20 natural numbers:

2

20

(2(1)+(20−1)2)

=10×(2+19×2)=10×40=400

Answer 2

Answer:

400

Step-by-step explanation:

The first 20 odd numbers are from 1 to 39.( 1,2,3,4,5,6,7,8...39)

When add all the above you will get 400.

That is the short and brief answer.

Hope it helps

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