Answered

1 + 2 = 1 , 2 + 3 = 3 , 3 + 4 = 6 , 4 + 5 = 10 , 5 + 6 = 15 , 6 + 7 = ?? hello, those anyone here have able to show the formula ?

Sagot :

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...!