ParthKohli
  • ParthKohli
These letters are the same when they are made upside-down: H, I, N, O, S, X, and Z.
Mathematics
schrodinger
  • schrodinger
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EvonHowell
  • EvonHowell
And what is the Question?
ParthKohli
  • ParthKohli
How many three-letter "words" can be formed that are the same when they are upside-down?
goformit100
  • goformit100
Fake Question....... not a mathematics question

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ParthKohli
  • ParthKohli
At first, I thought of \(7P3\), but then I saw that repetition is allowed, so I thought of \(21P3\)
ParthKohli
  • ParthKohli
@goformit100 It's called combinatorics.
ParthKohli
  • ParthKohli
Neither is correct.
goformit100
  • goformit100
Ok Then :)
anonymous
  • anonymous
7*7*1
anonymous
  • anonymous
so, 49
ParthKohli
  • ParthKohli
how the 1?
ParthKohli
  • ParthKohli
it might be 7 * 7 * 7
anonymous
  • anonymous
The first and the last letter must be same
ParthKohli
  • ParthKohli
Oh yes!
RadEn
  • RadEn
looks s and z made upside-down, they were not same :) |dw:1360990401416:dw|
ParthKohli
  • ParthKohli
@RadEn That is the mirror image, not the upside-down image. :-P
RadEn
  • RadEn
Ohhhh... missunderstanding :)

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