import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine());
		PrintWriter pw = new PrintWriter(System.out);
		for (int z = 0; z < t; z++) {
			int n = Integer.parseInt(br.readLine());
			String[] sa = br.readLine().split(" ");

			int max = 0;
			for (int i = 1; i < n; i++) {
				int len = sa[i].length();
				while (len > 0 && sa[i].charAt(len - 1) == '0') {
					len--;
					sa[i] = sa[i].substring(0, len);
				}
				max = Math.max(max, len);
			}
			for (int i = 1; i < n; i++) {
				StringBuilder sb = new StringBuilder();
				sb.append(sa[i]);
				while (sb.length() < max) {
					sb.append(0);
				}
				sa[i] = sb.toString();
			}

			int g = 1;
			for (int i = 0; i < max; i++) {
				g *= 10;
			}
			int gcd = g;
			for (int i = 1; i < n; i++) {
				if (!sa[i].equals("")) {
					int a = Integer.parseInt(sa[i]);
					gcd = gcd(gcd, a);
				}
			}
			g /= gcd;
			pw.println(g);
		}
		pw.flush();
		br.close();
	}

	static int gcd(int a, int b) {
		return b == 0 ? a : gcd(b, a % b);
	}
}