Payal Tandon
Co-founder, e-GMAT
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difference between permutation and combination

Difference between Permutation and Combination explained with examples

Permutations and Combinations is a topic full of conundrums. The biggest one is, understanding the difference between permutation and combination. Should I solve this...
permutation and combination gmat quant

Permutation and Combination | Avoid these 3 Mistakes | GMAT Quant

Like any GMAT Quant topic, Permutation and Combination has its own traps. Most students fall in these traps and ultimately, are not able to secure their target GMAT score....
gmat-permutation-combination-gmat-quant

GMAT Permutation and Combination | When to Add and Multiply

Are you always confused whether to add or multiply the cases while solving GMAT permutation and combination questions? Do you often get questions incorrect simply because...

If p, r, and s are consecutive integers in ascending order and x is the average (arithmetic mean) of the three integers – OG 2020 Question #304 with Solution

OG 2020: Question No. 304 If p, r, and s are consecutive integers in ascending order and x is the average (arithmetic mean) of the three integers,...
GMAT data sufficiency 3 mistakes to avoid in number properties

GMAT Data Sufficiency – 3 Mistake Students make in Number Properties questions

Typical GMAT data sufficiency questions are followed by information in the form of two or three statements. You have to figure out which statements...
Properties of Numbers - Even and Odd - Prime numbers - HCF and LCM

Properties of Numbers – Even & Odd | Prime | HCF & LCM

Hello Reader, We see that you want to know the basics and properties of numbers. You have landed just at the right place.  Purpose of the...
GMAT Factorials - Variations in Factorial Manipulation

GMAT Factorials – Variations in Factorial Manipulation

On the GMAT, Factorial is an interesting concept in number properties from which many application-oriented questions are asked. In this article, we...

Category: Number Properties

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Eight light bulbs numbered 1 through 8 are arranged in a circle as shown above. The bulbs are wired so that every third bulb, counting in a clockwise direction, flashes until all bulbs have flashed once. If the bulb numbered 1 flashes first, which numbered bulb will flash last? – OGQR 2020 Question #102 with Solution

A 2 min read OGQR 2020: Question No. 102 Eight light bulbs numbered 1 through 8 are arranged in a circle as shown above. The bulbs are wired so that every third bulb, counting in a clockwise direction, flashes until all bulbs...

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