Read Positive Integer N And Plot 3 Triangles Of Size N

Write a Java program that reads positive integer n, 1 ≤ n ≤ 13, and plots 3 triangles of size n as shown below.

For n = 4, for instance, the program should plot: (works for n = 5 and n = 6 etc.)

triangle 1

1
2 3
4 5 6
7 8 9 10

triangle 2

_ _ _ 1
_ _ 3 2
_ 6 5 4
10 9 8 7

triangle 3

_ _ _ 1
_ _ 3 3 3
_ 5 5 5 5 5
7 7 7 7 7 7 7

import java.util.Scanner;
class Loops { 
void plotTriangle1(int n) {
int t = 1;
for (int i = 1; i <= n; i++) {
System.out.println(" ");
for (int j = 1; j <= i; j++) {
System.out.printf("%3d", t++);

[Code] ....

Currently compiles to this: Enter n(1-13):4
1
2 3
4 5 6
7 8 9 10

Format of the triangles, I couldn't get the spacing to work so I used underscores to replicate the blank space....