Question

write the first 10 triangular number. use the addition rule

Answer 1

The sequence of triangular numbers, starting at the 0th triangular number, is. 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666...
hope it helps...

Answer 2

Step-by-step explanation:

first ten triangular number are:–n=1 0+1=1

n=2 1+2=3

n=3 1+2+3=6

n=4 1+2+3+4=10

n=5 1+2+3+4+5=15

n=61+2+3+4+5+6=21

n=7 1+2+3+4+5+6+7=28

n=8 1+2+3+4+5+6+7+8=36

n=9 1+2+3+4+5+6+7+8+9=45

n=10 1+2+3+4+5+6+7+8+9+10=55