Question

1+3+5+7+..........upto n odd numbers is equal to n^2 then find the value of 23+25+27+........89

Answer 1

Answer:

29 31.......81 because as the numbers exeeds by2

Answer 2

Answer:

This is an AP question

a1=23

l=89

d=2

l=a1+(n-1)d

From here

n=34

Then sum of all these terms are..

n/2(a+l)

=17x23+89

17x112

=1904