75.00
15.00
8.66
3.87
Correct answer is B
Note that 10√3√5=10√3√5×−√5√5
= 10√15√5=2√15
hence, (10√3√5−√15)2 = (2√15−√15)2
= (2√15−√15)(2√15−√15)
= 4√15×15−2√15×15−2√15x15+√15×15
= 4 x 15 - 2 x 15 - 2 x 15 + 15
= 60 - 30 - 30 + 15
= 15
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