Question

There is a stack of logs in the backyard. There are 15 logs in the 1st layer, 14

in the second, 13 in the third, 12 in the fourth, and so on with the last layer

having one log. How many logs are in the stack?​

Answer 1

Answer:

I think I don't this answer

Answer 2

Answer:

120

Step-by-step explanation:

15+14+13+12+11+10+9+8+7+6+5+4+3+2+1

=120