Question

find the sum of all even natural from 1 to 350​

Answer 1

Step-by-step explanation:

1+2+3+ ........+350

these terms are in AP

a=1

d=1

tn=350

Sn =n/2(a+tn)

=350/2(1+350)

=175(351)

=61425

Answer 2

Answer:30800

Step-by-step explanation:

This is a question Of arithmetic progression

Here common difference,d=2.

first term,a=2 . Last term,l=350

a+(n-1)d=350

2+(n-1)2=350

n=175

The eq of sum of n terms in an AP is

S= n/2 * ( a+l )

S=175/2 *(2+350)

= 176 * 175

=30800