How Do I Add Returned Javascript Array Items To Specific Textboxes

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C#

Javascript

Ajax

MVC5

good day ladies and gentlemen, I called a controller function using ajax as shown

function getbook()
{        $.ajax({
            type: "POST",
            url: "/Home/getBooked",
            data: { "bookNumber": mobile},
            success: function (succ) { // I need to add the items in succ to some text boxes as shown below
                $.each(succ, function (index, element) {
                        $('#tb1').val(element);
                        $('#tb2').val(element);
                    });                            },
            error: function (err) { alert("An error is thrown"); }
        });
}

but the issue is that only the last item in the parameter is shown in both text boxes.
when I used the alert function to display the contents of succ, it displayed both items.
clearly i'm missing something. i'll be glad if anyone could help