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For a non-zero rational number a ,\ a^7-...

For a non-zero rational number `a ,\ a^7-:a^(12)\ ` is equal to (a)`a^5` (b) `a^(-19)` (c) `a^(-5)` (d) `a^(19)`

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Verified by Experts

`=a^7diva^12=a^(7-12)=a^(-5)`.
Hence. option (c) is the correct answer.
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