#2
one is major, the other is minor.

major pent is the major scale missing the 4th and 7th
minor pent is the minor scale missing the 2nd and 6th
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#3
Minor pentatonic scale formula: T b3 4 5 b7 (5 notes, the nu,bers shown correspond to major, minor and perfect steps)

Major pentatonic scale formula: T 2 3 5 6 (5 notes again, same crap as above)


What makes the first scale minor is it's third step. since it's a minor 3rd (b3), the scale is minor.
Since the third step of the second corresponds do a major 3rd, the scale is major.

The scales are pentatonics since they consist in 5 notes per scale (penta=5)
#4
If to take relative minor and major pentatonic scales, for example:
C major pentatonic scale
and A minor pentatonic scale,
they consist of the same notes (C, D, E, G, A)
but the tonic (the note that begins a scale) is different.
In C major, it'd be C,
in A minor would be A.