Answers

2015-08-21T21:31:17+05:30
The answer is 18 because when you subtract 90-73 we get 28
0
2015-08-25T23:45:20+05:30
72 = 8*9
90 = 9*10
110 = 10*11
and so on
if u take 50 common u are left out with
50(1/8*9 +1/9*10+1/10*11 .........+1/99*100)
=50( 1/8-1/9+1/9-1/10+1/10-1/11.........+1/99-1/100)
=50(1/8-1/100)
=50[(100-8)/800]
=50*92/800
=23/4
2 5 2