This is the 1097th most frequent Japanese word.
複数
"複数" means "plural" or "multiple."
In this sentence, '複数' is used to indicate that there are more than one method that he tried.
彼は複数の方法を試みた。
He tried multiple methods.
Here, '複数' refers to the fact that more than one proposal was submitted, emphasizing a variety in options.
複数の案が提出されました。
Several proposals were submitted.
In this context, '複数' is applied to highlight that the action of visiting was performed more than once, quantifying the frequency.