-6
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You can only use these numbers once, so not square root or cubed root or anything else.

Good Luck!!

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  • $\begingroup$ What other rules are there besides no square root, or cubed root? Can we only use basic + - / * ? $\endgroup$ – n_plum Apr 12 '17 at 16:50
  • $\begingroup$ Anything. It could even be sine or cosine $\endgroup$ – Samuel Martin Apr 12 '17 at 16:51
  • $\begingroup$ You can only use the numbers once, so because there is no 2 or 3 you can't do square or cubes, but you can use any other operation. $\endgroup$ – Samuel Martin Apr 12 '17 at 16:55
  • 11
    $\begingroup$ Found it. It's the second number in the list. $\endgroup$ – Ian MacDonald Apr 12 '17 at 17:04
  • $\begingroup$ To eliminate Ian's solution: does each of the four numbers have to be used exactly once? $\endgroup$ – Rand al'Thor Apr 12 '17 at 17:11
5
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$25 * (9-8)^6$ ...........................

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2
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$25\times\lfloor\log(8+6-9)\rfloor$

or

$25+\lfloor\log\log(8+6-9)\rfloor$

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  • $\begingroup$ Also 25 | (9 & 8 & 6). $\endgroup$ – Ian MacDonald Apr 12 '17 at 17:22
1
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$25^{\left \lfloor log_{9}{6*8} \right \rfloor}$

.

$25^{\left \lfloor log_{8}{6*9} \right \rfloor}$

.

$25^{\left \lfloor log_{6}{\binom{9}{8}} \right \rfloor}$

.

:)

$ \left | 25, \Phi, ,\left \{ \Phi \right \}, \left \{ \left \{ \Phi \right \} \right \}, \cdots \right | + \left | 6, \Phi, ,\left \{ \Phi \right \}, \left \{ \left \{ \Phi \right \} \right \}, \cdots \right | + \left | 8, \Phi, ,\left \{ \Phi \right \}, \left \{ \left \{ \Phi \right \} \right \}, \cdots \right | + \left | 9, \Phi, ,\left \{ \Phi \right \}, \left \{ \left \{ \Phi \right \} \right \}, \cdots \right | $

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  • $\begingroup$ How did you get that answer? $\endgroup$ – Samuel Martin Apr 12 '17 at 17:14
  • $\begingroup$ @SamuelMartin: A better question is how can anybody not get the answer. $\endgroup$ – Name Apr 12 '17 at 17:18
  • $\begingroup$ @Name that's not really an explanation, Samuel is just asking how you thought of this $\endgroup$ – Beastly Gerbil Apr 12 '17 at 17:32
  • $\begingroup$ IMO once you say "Ah, I'll allow sine and cosine", the whole world of mathematical functions can be thrown at the numbers and nothing can stop you anymore. $\endgroup$ – greenturtle3141 Apr 12 '17 at 23:05
  • $\begingroup$ @Name can you please explain what's going on in your fourth solution? $\endgroup$ – greenturtle3141 Apr 12 '17 at 23:05
1
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My answer is to do this which is shown below

25%(6*8*9)

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  • $\begingroup$ How does this work? $\endgroup$ – Samuel Martin Apr 12 '17 at 18:16
  • 1
    $\begingroup$ mod means remainder when divided by, the remainder when 25 is divided by 432 is 25 $\endgroup$ – David Huang Apr 12 '17 at 18:21
  • $\begingroup$ I think % is only denoted as mod in computer science? $\endgroup$ – greenturtle3141 Apr 12 '17 at 23:06
  • $\begingroup$ Yeah, But I believe its still fine as you still get the ans. $\endgroup$ – David Huang Apr 12 '17 at 23:57

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