C-01-Q151mediumsingle_mcqS={(1,5),(2,10),(3,15),(4,20)}S = \{(1, 5), (2, 10), (3, 15), (4, 20)\}S={(1,5),(2,10),(3,15),(4,20)} এর বিপরীত অন্বয় S−1=?S^{-1} = ?S−1=?a{(1,5),(2,10),(3,15),(4,20)}\{(1, 5), (2, 10), (3, 15), (4, 20)\}{(1,5),(2,10),(3,15),(4,20)}b{(5,1),(10,2),(15,3),(20,4)}\{(5, 1), (10, 2), (15, 3), (20, 4)\}{(5,1),(10,2),(15,3),(20,4)}c{(1,1),(2,2),(3,3),(4,4)}\{(1, 1), (2, 2), (3, 3), (4, 4)\}{(1,1),(2,2),(3,3),(4,4)}d{(5,4),(10,3),(15,2),(20,1)}\{(5, 4), (10, 3), (15, 2), (20, 1)\}{(5,4),(10,3),(15,2),(20,1)}