Question

What is the Sum of First 70 even Numbers?
A. 4970
B. 4950
C. 4900
D. 4980
With explanation

Answer 1

SOLUTION

TO CHOOSE THE CORRECT OPTION

The Sum of First 70 even Numbers

A. 4970

B. 4950

C. 4900

D. 4980

EVALUATION

Here we have to find the Sum of First 70 even Numbers

First 70 even Numbers are

2 , 4 , 6 , 8 , ... , 140

This is an arithmetic progression

First term = 2

Last term = 140

Number of terms = 70

Hence the required sum

$\sf \: = \dfrac{n}{2} \times \: [ First \: term + Last \: term ]$

$\sf \: = \dfrac{70}{2} \times \: [ 2 + 140 ]$

$\sf \: = 35 \times 142$

$\sf \: = 4970$

FINAL ANSWER

Hence the correct option is A. 4970

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Answer 2

Correct answer:-A=4970

sum of first 70 even numbers like (2,4,6.....etc)

formula:- n(n+1)

Then:-70(70+1)

now:-70(71)

Answer is:-4970