how to set dropdown value in jquery

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2$('#ddlName option:selected').val();

1$('select[name^="salesrep"] option[value="Bruce Jones"]').attr("selected","selected");

1$("#comboboxid").val(yourvalue).trigger("chosen:updated");
2

1$('#ddlID').val('New_OptionValue').change()

1$('select[name^="salesrep"] option:selected').attr("selected",null);

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2$("#ddlPartnerType").val(0);