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1. Create an array state variable to store the selected options.
2. Add a dropdown component to the table column using the Material-UI Select component.
3. Use the useState hook to update the array state variable whenever an option is selected or deselected.
4. Add an event listener to the dropdown component that updates the array state variable.
5. Define a function that takes the array state variable as input and returns a string of the selected options separated by commas.
6. Display the string returned by the function in the table cell using the Material-UI Typography component.

Here is an example of what the code might look like:

import React, { useState } from 'react';
import { Table, TableBody, TableCell, TableHead, TableRow, Typography, Select, MenuItem } from '@material-ui/core';

const options = ['Option 1', 'Option 2', 'Option 3'];

function App() {
  const [selectedOptions, setSelectedOptions] = useState([]);

  const handleChange = (event) => {
    const selected = event.target.value;
    setSelectedOptions((prevSelected) => {
      if (prevSelected.includes(selected)) {
        return prevSelected.filter((option) => option !== selected);
      } else {
        return [...prevSelected, selected];
      }
    });
  };

  const formatOptions = (optionsArray) => {
    return optionsArray.join(', ');
  };

  return (
    <Table>
      <TableHead>
        <TableRow>
          <TableCell>Selected Options</TableCell>
        </TableRow>
      </TableHead>
      <TableBody>
        <TableRow>
          <TableCell>
            <Select multiple value={selectedOptions} onChange={handleChange}>
              {options.map((option) => (
                <MenuItem key={option} value={option}>
                  {option}
                </MenuItem>
              ))}
            </Select>
          </TableCell>
        </TableRow>
        <TableRow>
          <TableCell>
            <Typography>{formatOptions(selectedOptions)}</Typography>
          </TableCell>
        </TableRow>
      </TableBody>
    </Table>
  );
}

export default App;