It's just easy

Level 1

What's can be the beginning ?

x , 5 , 25 , 125... x\quad ,\quad 5\quad ,\quad 25\quad ,\quad 125...

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Abda Ji-a by Abda Ji-a , 27, Canada

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2 solutions

Syed Baqir
Sep 7, 2015

We are just multiplying 5 and the series follows the following pattern:

5^n where n = 0 , 1 ,2 ...

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Smiti Mittal
Sep 7, 2015

These are powers of 5 . 5^1=5 5^2=25 5^3=125 So the first one must be 5^0. Anythinh to the power 0 is one, hence it must be one Another way to look at it is that it is previous number 5, so x 5=5, this implies x=1

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