Prime Minister Manmohan Singh on Friday invoked youth power to pitch for greater understanding between India and China,saying it will make "our friendship a mighty force". Singh underlined the need for strengthening people-to-people contacts as he interacted with a group of Chinese youth at his residence here. "People-to-people exchanges are important in enhancing mutual understanding. Youth of the two country should be on the same wavelength. That will make our friendship a mighty force," he said during his interaction with the group. Singh,who has been a strong votary of friendly relations with China,said,"In my talks with the Chinese leadership we all agreed and stressed that people-to-people contacts should be strengthened." Welcoming the group,he wished them a wonderful stay in India.