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Find the appropriate number in place of the symbol '?' in the following. Let 'k' be any non zero integer
`k ^(15) xx k ^(?) = k ^( 31)`

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  13. Simplify and write in the form of a^(m-n) or 1/ a^(n-m) : 13^8 / 13^5.

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  17. Complete the following : (3/2)^square= (3^5)/(2^5).

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