Not so logical.

Logic Level 3

What number should be in the square such that the sequence has a particular pattern? \[\begin{array} {} 521; 612; & \huge\square &; 215; 927; ...\end{array}\]

This is part of the series: " It's easy, believe me! "


The answer is 343.

Thành Đạt Lê by Thành Đạt Lê , 17, Singapore

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2 solutions

Vilakshan Gupta
Sep 9, 2017

Reverse the numbers and they form a series of perfect cubes , that is 5 3 , 6 3 , 7 3 , 8 3 ⋯ \large 5^3,6^3,\boxed{7^3},8^3 \cdots

1 Helpful 0 Interesting 0 Brilliant 0 Confused

nice. I even not thougtht about it.

Saksham Jain - 3 years, 7 months ago

Try to write the numbers backward and you will see the solution to this problem: \[\begin{array} {}125; 216; & \huge \square & ; 512; 729; ...\end{array}\]

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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