Question

Q.3 Solve the following: (Any 2)
(6)
). Find the sum of first 123 even natural numbers.
m) Solve the simultaneous equation by using Cramer's Rule Method​

Answer 1

Step-by-step explanation:

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