Singleton.

Singleton
Singleton of a number is a single digit number which you get after adding all the digits of that number , if the resultant is not a single digit number than you again add it back.
Ex :
Singleton(23453) = 2+3+4+5+3 = 17 => 1+7 => 8
Singleton(343) = 3+4+3 = 10 => 1 + 0 => 1
Singleton(534533256) = 9 or 0
Note : While calculating the Singleton , you can banish those numbers which add up to 9 , Remember : Singleton(9+x) = Singleton(x)
So when you find Singleton(918754) , you can ignore
– 9
– 8 and 1
– 4 and 5
so , you are left with 7 , which is the Singleton