SSC MTS Model Paper 7

Question : 77 of 99

Marks: +1, -0

The sum of all the 3-digit numbers is

Solution:

(b) rirst 3 - digit number =100
Last 3— digit number = 999
Number of terms = 900

{ S } = { { n } } /{ 2 [ { a } + 1 ] }

= { 900 } /{ 2 } [ 100 + 999 ]

= 450 x 1099 = 494550

Go to Question:

Prev Question

Next Question