Question

It 101+102+103 +104 +...... tm = 15050, then
m=?
plzzz answer fast​

Answer 1

101+102+103+.....+Tm=15050

a=101 ; d=1

Sn=n/2(2a+(n-1)d)

15050=n/2(101×2+(n-1)1) simplify this equation

15050×2=202n+n^2-n

n^2+201n-30100=0

solve the quadratic equation you will get two values one positive and second negative

negative is not possible because value of n can't be negative so take the positive value of n

then,

n=100

tm=a+(n-1)d

tm=101+(100-1)1

tm=101+99

tm=200