Question

find the sum of the first 123 even natural number
​

Answer 1

Answer:

We know that even natural numbers are 2,4,6,8,10.......

It is in AP series 

So, 

a=2

d=2

n=123

S=2n[2a+(n−1)d]

S=2123[2×2+(123−1)×2]

S=2123[4+122×2]

S=123×124

S=15252

hope u understand

Step-by-step explanation:

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Answer 2

Answer:

15252

Step-by-step explanation:

ANSWER

We know that even natural numbers are 2,4,6,8,10.......

It is in AP series

So,

a=2

d=2

n=123

S=

2

n

​

[2a+(n−1)d]

S=

2

123

​

[2×2+(123−1)×2]

S= 2

123 [4+122×2]

S=123×124

S=15252