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Group B is the repeated identity in 2 scenarios. You can draw model to visualise.
Group A : 2u
Group B : 3u
Group C : 6u
Diff between A and B is 1u.
Hence 1u = 12
Number of students altogether will be the total number of units.
Group A : 2u
Group B : 3u
Group C : 6u
Diff between A and B is 1u.
Hence 1u = 12
Number of students altogether will be the total number of units.
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