23. If 5a = 3125, find the value of a. (1) 5 (2) 4 (3) 6 (4) 3

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23. (1) ( 5^{a}=3125 ) ( 5^{a}=5^{5} ) ( begin{array}{ll}Rightarrow & quad 5= & a=5end{array} quad[text { comparing the indices }] )

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