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In my opinion option C is correct
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(a)x127−x57=x57+1−x57
=x57.x−x57
(b) (x4)13−−−−−√12=((x4)13)112
=x4×13×112=x19
≠x
(c)(x3−−√)23=(x23)23=x32×23
x
(d) x127×x712=x127+712
x144+4984=x19384≠x [am.an=am+n]
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