Ok i understood now. Its no where mentioned(or maybe i didnt understand) taht first we have to check for the enire number.
What i understood from the question was that

952406 -> Remove first num -> 9 Bingo multiple of 3
similarly thats why i asked why is 36.
but now i understood. Thanks.

Let's start with a bigger number first and it will become clear.
952406 => not a multiple of three
95240 => not a multiple of three
9524 => not a multiple of three
952 => not a multiple of three
95 => not a multiple of three
9 => Bingo! return 9

36 => Bingo! Remove nothing, return 36

Return n if the input is already a multiple of three

last number starts from the right (units' place, then tens', then hundreds' ...)

In the tests why does 36 return 36?
and what do they mean by last number? is it starting from left or right?
and from any side they start 36 should either return 3 or return 6 as both are multiple of 3. The question is not understood to me. Can please anyone help me understand the problem statement.

So is this a wrong test? As my test is also failing here

nope, you still need to do import kotlin.math.pow

import here? how? I am using kotlin language

Math.pow(x,y) in JAVA. in kotling we do x.pow(y)

I think the method 'pow' belongs to the Math class. It's static so you invoke it like this 'Math.pow(someInt,someOtherInt)'
And it needs two parameters, no?
The Math class lives in java.lang so you don't need to import it.
Apologies if you're thinking of a different pow method.

You have to import it before you can use it.

Why does it give tis error : error: unresolved reference: pow
sum += (listOfNumbers[i].toDouble().pow(p + i))

I am trying to use the "pow" funtion. why does it say unresolved reference: pow?