The present paper studies the existence of weak solutions forwhere Ω ⊂ R N is a smooth bounded domain with smooth boundary, s1, s2 ∈ (0, 1), 1 < pi < N s i , i = 1, 2, fi and gi has certain growth assumptions for i = 1, 2. We prove existence of at least three non negative solutions of (P) under restrictive range of λ using variational methods. As a consequence, we also conclude that a similar result can be obtained when we consider a more general non local operator L φ i instead of (−∆) s i p i in (P). Contents 1. Introduction 1 2. Preliminaries 3 2.1. Assumptions on f i and g i , i = 1, 2 4 3. Proof of Theorem 2.2 6 4. Proof of Theorem 2.3 12 5. Proof of Theorem 2.4 14 6. Acknowledgement 15 References 15