What is the index of 7 in this list? that list being [5, 6, 10, 7, 3, 2.5]

7
4
2
3

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-1 (out of range).

Explanation:

Index '7' cannot exist in 0-indexed array of size '6'.

If return type is 'Integer' out-of-range exception should be thrown.

[ 0, 1,  2, 3, 4,  5] :: indices. (length = 6)

[ 5, 6, 10, 7, 3, 2.5 ] :: elements.

-1 (out of range).

Explanation:

Index '7' cannot exist in 0-indexed array of size '6'.

If return type is 'Integer' out-of-range exception should be thrown.

[ 0, 1,  2, 3, 4,  5] :: indices. (length = 6)

[ 5, 6, 10, 7, 3, 2.5 ] :: elements.