FACTBOX: Scenarios for Serbia after ambivalent vote

(Reuters) - An alliance of pro-Western parties led by the Democratic Party won first place in Serbia's general election on Sunday, slightly ahead of the nationalist Radicals.

Results indicated a scramble to clinch a parliamentary majority and a new governing coalition. Here are some scenarios for what could happen next, with the strength of each possible grouping in the 250-seat parliament:

PRO-WESTERN COALITION/ NATIONALIST- PRO-WESTERN COALITION

SEATS: between 123 and 140

The only way for the Democrats to form a majority government is through an alliance with several ethnic minority parties, and one or two minor partners: the small, ultra-liberal Liberal Democratic Party (LDP) and the Socialists, the once-dominant party of the late Slobodan Milosevic.

The Socialists have indicated they will not formally ally with the LDP -- the only party that says Serbia should accept the secession of Kosovo -- but might be persuaded to support the coalition in parliament in exchange for concessions.

It is unclear if the LDP would agree to such a compromise, which it could justify only as a last resort to keep the Radicals out of power. Such a government would probably be tested by divisions over key issues, such as Kosovo and Serbia's EU future.

THREE-PARTY NATIONALIST COALITION

SEATS: 127