If 9999=4
8888=8
1818=4
1212=0
then 1919=?

???????????? 9999=4=1818 ??????????????
answered Jul 2, 2013 by anonymous
1919 = 2
answered Jul 2, 2013 by anonymous
8888+1818-9999+1212=1919, so 8+4-4+0=8... Therefore answer is 8..
answered Jul 7, 2013 by archit
answered Jul 18, 2013 by Bhavesh Gandhi
answered Oct 10, 2013 by SANJAY

It is number of circles in the number

8 has 2 circles, 9 has 1
answered Oct 15, 2013 by Vijay Joshi
answer is 2. number of circles in each digit.. 1919 has 02 circles in 9
answered Oct 17, 2013 by balaji selva
1919=2, Just count the circles in the number.

8888 has 8 circles, whereas 9999 has 4 circles.
answered Oct 20, 2013 by Prashant Namdeo (AKA V3nom)
answered Jan 11, 2014 by Bassam Rousan

How?
If you observe carefully, right side number is equal to total number of circles in the left side numbers. thus the answer to 1919 should be 2.

answered Jun 16, 2014 by Surjeet Mukherjee
count the circle in  9999 has 4 and 8888 has 8 so on.
answered Jun 27, 2014 by Neeraj Singh
The reasoning is as follows:
For 9999, there are 4 closed regions (consider the top part of the digit 9) and no other digits, so 9999=4
For 8888, there are 8 closed regions (consider the top part and the bottom part of the digit 8) and no other digits, so 8888=8
For 1816, there are 3 closed regions (2 of the digit 8 and 1 of the digit 6) and 2 other digits, so 1816=3*2=6
For 1212, there are 0 closed regions (digits 1 and 2 do not have closed regions) and 4 other digits, so 1212=0*4=0

Use same calculation for 1919, there are 2 closed regions (digit 9) and 2 other digits, so 1919=2*2=4

Given a number N, f(N) is defined as follows:
Count the number of closed regions for each digit of N, and get total T.
If every digit has closed regions, then f(N)=T
Else if R digits do not have closed regions, then f(N)=T*R
So f(9999)=4 and f(8888)=8 and f(1816)=6 and f(1212)=0 and f(1919)=4.
answered Jun 27, 2014 by anonymous
2 is the answer.its equal to the number or circles in d left side.
answered Jul 9, 2014 by palash
If 9999=4 8888=8 1818=4 1212=0 then 1919=? ans .2
answered Jul 14, 2014 by anonymous
2 circules
2 The number of o's 9 upper cross-section is an o 8 if cross sectioned we have two o's
answered Jun 18, 2015 by ravi
9999=4    9=1  >> 1+1+1+1=4

8888=8   8=2  >> 2+2+2+2=8

1818=4   1=0  >> 0+2+0+2=4

1212=0   2=0  >> 0+0+0+0=0

then 1919= >>0+1+0+1=2
answered May 16 by Jeff Lesmeister