Question

What is the sum of all even numbers from 21 to 70.​

Answer 1

Series =22+24+26...+50

First even no. = 22

Last even no. = 50

difference = 2

Number of terms

=Last no.−first no.difference+1

=50−222+1=14+1=15

Sum of 'n' numbers

n2[2a+(n−1)d]

where 'a' is first no. and 'd' is difference

sum

=152[(2×22)+(15−1)2]=152[72]

15×36=540

HOPE THIS HELP YOU OUT

Answer 2

Answer:

1150 is the answer okkkkkk