Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_22481967_1 (builder VARCHAR, withdrawn VARCHAR, number VARCHAR)

### Question ###
List the number of builders where the withdrawn is 1951 and number is 42.

### Accurate SQL ###

SELECT COUNT(builder) FROM table_22481967_1 WHERE withdrawn = "1951" AND number = "42"