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3) Which is of the following is true:
a. 108 x 105 = (10)8-5 = 1013
b. 108 x 105 = (10)5-8 = 10-3
c. 108 x 105 = (10)8+5 = 1013
d. 108 x 105 = (10)8+5 = 1013​