Missing Letter Puzzle for Interviews, Placement and Competitive Exams

MISSING LETTER PUZZLES Answer : K Explanation : The numerical values of the letters in opposite segments of the circle always add up to 17.…

Missing Number puzzles: Interviews, Placements and Competitive Exams

MISSING NUMBER PUZZLES   Answer : 6 Explanation : Looking at the diagram in rows, the central circle equals half the sum of the numbers…

Shortcuts on Square Roots and Cube Roots

Square Roots and Cube Roots To find the square root of a number, you want to find some number that when multiplied by itself gives you the…

Lateral Thinking Puzzles

LATERAL THINKING PUZZLES LATERAL THINKING:The solving of problems by an indirect and creative approach, typically through viewing the problem in a new and unusual light.…

Important algebra identities and questions

Some Basic Formulae: (a + b)(a – b) = (a2 – b2) (a + b)2 = (a2 + b2 + 2ab) (a – b)2 = (a2 + b2 – 2ab) (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca) (a3 + b3) = (a + b)(a2 – ab + b2) (a3 – b3) = (a – b)(a2 + ab + b2) (a3 + b3 + c3 – 3abc)…

Tips and Tricks to solve aptitude problems on Mixtures and Alligation

Alligation:It is the rule that enables us to find the ratio in which two or more ingredients at the given price must be mixed to…

Tricks to solve surds and indices

Laws of Indices: am x an = am + n am = am – n an (am)n = amn (ab)n = anbn a n = an b bn a0 = 1 Surds:Let a be rational number and n be a positive integer such…

Important Formulas of Pipes and Cistern

Inlet:A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an inlet.Outlet: A pipe connected with a…

Tips and Tricks related to Stocks and Shares

Stock Capital:The total amount of money needed to run the company is called the stock capital. Shares or Stock:The whole capital is divided into small units,…

Short cut tricks to find square root and cube root of a number

CUBE ROOT OF A NUMBER REMEMBERING UNITS DIGITS: First we need to remember cubes of 1 to 10 and unit digits of these cubes. The…