Question

Find the sum of first 123 even natural numbers.
$\boxed{\text{Plz give step by step explanation}}$

Answer 1

Answer:

we know that the even natural number are 2,4,6,8,10 ..

so,

a=2

d=2

n=123

Step-by-step explanation:

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

S= 123/2 [2×2+ (123-1)×2]

S=123/2 [2+122×2]

S= 123×124

S=15252 .