eng Science and Education Publishing Turkish Journal of Analysis and Number Theory 2333-1232 2023-05-30 11 1 7 18 10.12691/tjant-11-1-2 TJANT20231112 article Stability Results of the Additive and Quartic Functional Equations in Random p-Normed Spaces Sushma Devi sheoransushma50841@gmail.com 1 Asha Rani 2 3 Manoj Kumar 3 Kanya Mahavidyalaya, Kharkhoda Pt. NRS Govt. College, Rohtak In this paper, we investigate the Hyers-Ulam stability of mixed type additive and quartic functional equations in Random p-normed spaces by direct and fixed-point method. http://pubs.sciepub.com/tjant/11/1/2/tjant-11-1-2.pdf Hyers-Ulam stability additive functional equation quartic functional equation random p-normed spaces fixed point method direct method