IQ Matters

Number Theory Level 1

There exist a relation between the 1st and the 2nd term. The same relation exists between all the pairs. Find the unknown term. If 3-18 ,4-48 , 5-100 , 6- ??


The answer is 180.

Gaurav Sharma by Gaurav Sharma , 24, India

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2 solutions

Ishan Phansalkar
Nov 10, 2014

3:18 3 ^ 2 * (3-1) ,
4:48 4 ^ 2 * (4-1) ,
5:100 5 ^ 2 * (5-1) ,
6:x , x = 6 ^ 2 * (6-1) ,
= 36 * 5 = 180


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Gaurav Sharma
Nov 7, 2014

if the first term is n then the second term is n^3-n^2. Eg : if 5 is the first term then the second term is 125-25 = 100

Therefore the unknown term is 6^3-6^2 = 216-36=180 !

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there is one more answer . 3x6=18 4x12=48 5x24=100 6x48=288 so my answer is correct

Aashish Patel - 6 years, 5 months ago

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100 = 5 × 20 100=5 \times 20 , not 5 × 24 5 \times 24

Trí Onii-sama - 6 years, 5 months ago

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