Question

(1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+...+100+100).(89.2)

Answer 1

2.(1+2+3+4+.....+100).(89.2)

2.5050.89.2

2(5050.89)

=898900

Answer 2

(1+1+2+2+3+3+4+4+5+5+6+6+...+100+100)* (89 *2 )

=(1+100)+(1+100)+(2+99)+...+(54+57)+(55+56)+(55+56)*187

=101+101+101+...+101+101+101*187

=101*100*187

=10100*187=1888700

Answer 3

2(1+2+3+...+100).89.2=2.5050.89.2=1797800