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Find the number of teerms with non-zero ...

Find the number of teerms with non-zero coefficients in `(4x-7y)^(49)+(4x+7y)^(49).`

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The correct Answer is:
`:.` The number of terms with non-zero coefficient in `(4x-7y)^(49)+(4x+7y)^(49)` is 25.
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