Answers

2015-11-29T18:06:56+08:00
So, therefore...
1+2=1;
Difference between the above and below equations is 2. 
2+3=3;
Difference between the above and below equations is 3.
3+4=6;
Difference between the above and below equations is 4.
4+5=10;
Difference between the above and below equations is 5. 
5+6=15;
So if we used our common sense... The difference here is 6... 
6+7=?
So the answer here is 21 because 15 +6=21... 

I hope this will help...!
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