If set A={1,2,3,4,5} and set B={1,7,6,8} then which of the following is not true?

Let A = {1,2,3,4} and B = {7,8,9} , then which of the following relations is a mapping or not from set A to set B ? R_4 = {(1,7),(2,8),(3,7),(4,8)}

Let A = {1,2,3,4} and B = {7,8,9} , then which of the following relations is a mapping or not from set A to set B ? R_1 ={(1,7),(2,8),(1,8),(4,9)}

Let A = {1,2,3,4} and B = {7,8,9} , then which of the following relations is a mapping or not from set A to set B ? R_2 = {(1,7),(2,7),(3,7),(4,7)}

Let A = {1,2,3,4} and B = {7,8,9} , then which of the following relations is a mapping or not from set A to set B ? R_3 = {(1,8),(2,9),(3,8),(4,8)}

If A-{1, 2}, B={1, 2, 3, 4}, C={5, 6} and D={5, 6, 7, 8} then state which of the following statement is true.

Given the sets A = {1,3,5}, B = {2,4,6} and C = {0,2,4,6,8} , which of the following may be considered as universal set(s) for all the three sets A,B and C ? (i) {0,1,2,3,4,5,6} (ii) phi (iii) {0,1,2,3,4,5,6,7,8,9,10} (iv) {1,2,3,4,5,6,7,8} .

Given the set A={1,3,5},B={2,4,6} and C={0,2,4,6,8}, which of the following may be considered as universal set(s) for all the three sets A,B and C {0,1,2,3,4,5,6,7,8,9,10}

Given the set A={1,3,5},B={2,4,6} and C={0,2,4,6,8}, which of the following may be considered as universal set(s) for all the three sets A,B and C {1,2,3,4,5,6,7,8}