The sum of all coefficients in expansion of $(2 x - 3 y + z)^{7}$

6^{7}

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2^{7}

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- (6)^{7}

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N o n e o f t h e s e

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Solution

The correct option is D $N o n e o f t h e s e$
Given that,
${(2 x - 3 y + z)}^{7}$
Sum of all coefficients in the expression.
{Putting $x = y = z = 1$ }
$\begin{matrix} = {(2 \times 1 - 3 \times 1 + 1)}^{7} = 0 \end{matrix}$
$∴$ Option $D$ is correct answer.

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