Question

By studying the pattern given below
evaluate the following:
1+2= 2 X3/2
1+2+3 = 3x4/2
1+2+3+4= 4x5/2



a) 1+2+3+...+100​

Answer 1

1+2=2*3/2= use BODMAS formula
3=6/2
3=4 change its side from add to sub
4-3=1



1+2+3=3*4/2 same BODMAS formula
3+3=12/2
6=6 change its side
6-6=0


1+2+3+4=4*5/2
BODMAS formula
3+7=20/2
10=20/2=10
Change the correct side
10-10=0



Hope it helps!