Whats is the next number in this series 0,6,6,60,?

Answer 1

Answer: 654

Take first two together as 06 then subtract first digit i.e. 06 - 0 = 6
Now take 2 & 3 digit together & subtract 2 digit from them i.e. 66-6=60 .
Similarly take 3 & 4 digit together and subtract 3 digit from them i.e. 660-6= 654