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# HAVE picture, a cube " ABCDEFGH ", ask the value of angle

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Manager
Joined: 27 Jul 2003
Posts: 122
Location: Singapore
HAVE picture, a cube " ABCDEFGH ", ask the value of angle [#permalink]

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06 Oct 2003, 00:15
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1. HAVE picture, a cube " ABCDEFGH ", ask the value of angle BEG,
the BE, EG, BG is the diagonal of three adjacent surface of the cube:

2. Five letters: G, D, I, I, F form some strings such as GDIIF OR
DGIFI, how many strings there are if there is at least a letters
between the two letters I?
SVP
Joined: 03 Feb 2003
Posts: 1604

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06 Oct 2003, 00:27
(2) total—wrong (both Is come together)

T=5!/2!=60
W=4!=24

60-24=36

(1) since it is a cube, all its surface diagonals are equeal, so the triangle BEG is equilateral, so BEG=60
06 Oct 2003, 00:27
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