IBPS Specialist Officers Exam: QA-Problem Based On Numbers-Concept & Sample Questions

Institute of Banking and Personnel Selection (IBPS) will organize common written examination for recruitment of Specialist Officers. The IBPS SO Exam 2015 will be conducted in the month of February 2015.

The banking team of jagranjosh.com has come up with concept and sample questions for Number of Problems (Quantitative Aptitude). The concept provided by us will help you to understand the topic. The sample questions offered by us are framed by keeping in view need of the question paper.

Basic Rules on Natural Numbers

(i) One digit numbers are from 1 to 9. There are 9 one digit numbers ie, 9 X 10⁰.

(ii) Two digit numbers are from 10 to 99. There are 90 two digit numbers ie, 9 X 10¹.

(iii) Three digit numbers are from 100 to 999. There are 900 three digit numbers ie, 9 X 10². In general the numbers of n digit numbers are 9 X 10^(n-1).

(iv) Sum of the first n natural numbers ie,

(v) Sum of the squares of the first n natural numbers ie

(vi) Sum of the cubes of first n natural numbers ie,

Basic Formulae

Sample Questions with Solutions and Explanations