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Find 989^(3) using alternative method...

Find `989^(3)` using alternative method

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Here a =9 and b=8 .In this situtation where a and b are not small it may not be possible to calculate `3a^(2)xxb` and `3axxb^(2)` quickly .In such a situtation we simplify the working as follows

`therefore (98)^(3)=941192`
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