Question

1. श्रेणी 9 + 99 + 999 + ... के 100 पदों तक
का योगफल क्या है?​

Answer 1

Answer:

999+99-1099+9-1108yes this is a answer

Answer 2

Answer:

First of all bhai English mein bhi diya kro todha tough lagta hai hindi mein

446400

Step-by-step explanation:

n=100

a=9

d=90

Sn=?

By Sn Formula,

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

S100=100/2(2×9+(100-1)90)

S100=50(18+8910)

S100=446400