A stretch string can be used as a musical instrument. What is the fundamental frequency of a stretched string?

A sonometer wire of length 30 cm vibrates in the second overtone A violin string resonates in its fundamental frequency of 196hz .Where along the string must you place your finger so that the fundamental frequency becomes 440hz ,If the length of violin string is 40 cm .

A boy plucks at the centre of a stretched string of length 1m and observes a wave pattern. Which type of wave is produced on the string?