Brain Breakers

Maxstar

Moderator, Windows Update Expert, Security Analyst
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The pseudorandom generator = x[n+1]=(8x[n] + 7) mod 50
Let's start from: x[0]=11, In which interval is the period of the sequence obtained?

1) [1,10]
2) [11,20]
3) [21,30]
4) [31,40]
5) [41,50]
 
Last edited:
OUPS! I didn't see the spoiler! Doesn't count I guess. :)
 
The only thing I can think is:

7 - 11 ≠ 5 (move the horizontal match from 17 and put it above the equal sign) 🤔
 
I guess you're right , just move the horizontal match from 17 on top to the middle 7 - 1 - 1 = 5....:-)
 
Oh!

That way the equation remains as such! Clever!!!
 
I really like such things and puzzles which are usually quite simple and sometimes very tricky...
 

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