Determine the sum: 25/72 + 25/90 + 25/110 + .......... + 25/9900

Question

vijay · Answer

112 + 100 = 212

anonymous · Answer

am i reading it wrong? im seeing:
$$\frac{25}{72}+\frac{25}{90}+\frac{25}{110}+\cdots +\frac{25}{9900}$$
since each number is less than one, i dont think the answer can be as big as 212.

anonymous · Answer

do you see a pattern in the denominators Estudier? i got nothing so far >.<

anonymous · Answer

Cant even tell how many terms there are.

anonymous · Answer

I suppose 18,20..but this just speculation.

anonymous · Answer

yeah, i dont see anything other than that >.<

anonymous · Answer

Lot's of 9's about but the 110 ..

anonymous · Answer

They all reduce by 5's except the first...

anonymous · Answer

Maybe it should be 25/70

anonymous · Answer

that would make sense.  These types of problems arent supposed to be this hard >.< lol

anonymous · Answer

That would do it,I think...

anonymous · Answer

Blast, u can't get to 9900 with +4k...

anonymous · Answer

theres gotta be a typo somewhere.  It should be clear what type of series we have and how to solve.

anonymous · Answer

Agree...

anonymous · Answer

Reckon it's supposed to be 6...to 25/9910 with 25/70 to start. http://www.wolframalpha.com/input/?i=sum+5%2F%2814%2B4k%29%2C+k%3D+1..492

anonymous · Answer

lolol >.< ridiculous

anonymous · Answer

:-)

anonymous · Answer

Nah, no typo I typed it out myself right off the sheet.

anonymous · Answer

Best answer your are gonna get...about 6

anonymous · Answer

Thanks both of you.