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Find a, b and n in the expansion of (...

Find a, b and n in the expansion of `(a+b)^n` if the first three terms of the expansion are 729, 7290 and 30375, respectively.

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Given
`T_{1}=729, T_{2}=7290` and `T_{3}=30375`
Now,
`\ ^{n} C_{0} a^{n} b^{0}=729 `
...
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