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```
(define factorials (cons-stream 1 (mul-streams (add-streams ones integers) factorials)))
```

To make the stream have the nth element be n+1!, shoudn't the function be:

```
(define factorials
(cons-stream 1
(mul-streams factorials (stream-cdr integers))))
```

I believe the above is wrong, because `integers' start at 1 and we want the factorial of `n + 1'. Also, it's missing the `mul-streams'. Here's my solution: