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MULTIPLE CHOICE! HELP! Explain your answer (if possible)

Which of the following is equivalent to
3²⁰ x 2¹⁰
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3 x 2²


a) 3²⁰ x 2⁵

b) 3²⁰  x 2²⁰

c) 3¹⁹ x 2⁸

d) 6³⁰
   ------
     6³