Question

Please help , Medal & Fan For Best Answer ! <3 <3

A. the sum is (9*10)/2
B. the sum is (9*10)
c. the sum is (10*11)/2
d. the sum is (10*11)

Answer 1

What's the question?

Answer 2

1=1=(1*2)/2
1+2=3=(2*3)/2
1+2+3=6=(3*4)/2
1+2+3+4= 10= (4*5)/2
1+2+3+4+5=15=(5*6)/2

Answer 3

What conjecture can you make about the sum of the first 10 integers

Answer 4

So every time the number goes up once the two numbers you multiply by change once.

So 1+2+3+4+5+6= 21 = (6*7)/2
So you would keep going until you to the tenth one.
I'll just skip ahead.
1+2+3+4+5+6+7+8+9+10= 55= (10*11)/2