To count the number of squares in a grid of size `m x n`

using JavaScript, you can use the formula `(m * (m + 1) * n * (n + 1)) / 4`

. The formula calculates the total number of squares in a grid of size `m x n`

by multiplying `m`

by `m + 1`

and `n`

by `n + 1`

and dividing the result by 4. Here’s an example:

```
function countSquares(m, n) {
return (m * (m + 1) * n * (n + 1)) / 4;
}
const m = 3;
const n = 4;
const count = countSquares(m, n);
console.log(`The number of squares in a ${m} x ${n} grid is: ${count}.`);
```

In the example above, the `countSquares`

function takes `m`

and `n`

as arguments. The formula is used to calculate the total number of squares in a grid of size `m x n`

. The result is logged to the console.

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