Arithmetic and Geometric Progression
Arithmetic Progression Sum and Product
Let a1, a2, a3 , a4 be an A.P. of four terms such that each term of the A. P. and its common difference ℓ are integers. If a1 + a2 + a3 + a4 = 48 and a1 a2 a3 a4 + ℓ4 = 361 then the largest term of the A.P. is equal to