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Cyberchase
Lock Combinations
Matt and Jackie have three differently-colored keys and knobs. They need to use one combination of key and knob to open the door. They organize all of the available combinations into a grid of possibilities and calculate that they have 9 total combinations. As they attempt each combination, they mark down which combination was used until they find the working one.
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Video Transcript
0:00
so let's organize our choices
0:03
three knots
0:04
orange green purple
0:05
and to make a combination
0:07
we match not with a key
0:09
red
0:10
blue yellow
0:12
but that's only three combos what happens if we lay them out like this
0:16
cool
0:17
now it's like a grid of possibilities
0:20
this one is green op + blue key
0:23
and this square is purple Nob plus red key
0:26
a square for every combination and a combination in every Square
0:30
R
0:30
I think we're onto something
0:32
three keys by three knobs
0:34
makes nine squares
0:36
looks like we have nine different combinations to try
0:39
the same as the number of knobs 3
0:41
multiplied by the number of keys
0:43
three
0:44
I forgot which combinations we already tried
0:47
let's start over and check off the combinations as we go
0:50
okay
0:51
the first combination is orange knob red key
0:58
wrong combination
1:00
next up
1:01
orange knob blue key
1:03
mark it
1:05
nope
1:06
let's try again
1:09
this is the last combination
1:11
kids better work
1:15
yes
