CREATE TABLE table_12424 ("Constituency number" TEXT, "Name" TEXT, "Reserved for  (  SC / ST /None ) " TEXT, "District" TEXT, "Number of electorates  ( 2009 ) " FLOAT)

Name the Number of electorates (2009 which has a Reserved for ( SC / ST /None) of none, and a Name of jahanabad?
SELECT MIN("Number of electorates (2009)") FROM table_12424 WHERE "Reserved for ( SC / ST /None)" = 'none' AND "Name" = 'jahanabad'
SELECT MIN("Number of electorates (2009)") FROM "table_12424" WHERE "Name" = 'jahanabad' AND "Reserved for ( SC / ST /None)" = 'none'