Question

Find the sum of first 123 even natural number ​

Answer 1

Answer:

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Explanation:

We know that even natural number are:

2,4,6,8,10...

It's in AP series

So,

a= 2

d = 2

n = 123

s = n/2 [ 2a +(n-1) d]

Putting the value

s = 123/2 [ 2*2+(123-1)*2]

s = 123/2[ 4+122*2]

s = 123 *2(2+122)

s = 123* 124

s = 15252 Ans

Answer 2

Explanation:

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