Question

sum of all three digit number​

Answer 1

Answer:

? I did not under stand the que

Answer 2

Answer:

45450

Step-by-step explanation:

a = 100

d = 1

L = 999

=> a + (n-1) d = 999

=> 100 + (n-1) (1) = 999

=> n-1 = 899

=> n = 900

Now,

Sn = n/2 ( a + l )

= 900/2 ( 101)

= 450 × 101

= 45450