Question 16 The reciprocal of 1 is (a) 1 (b) –1 (c) 0 (d) Not defined
The reciprocal of 1 is the number itself. [∵1=11=1]
Hence, option (a) is correct.
Question 17 The reciprocal of -1 is (a) 1 (b) –1 (c) 0 (d) Not defined
Question 18 The reciprocal of 0 is (a) 1 (b) –1 (c) 0 (d) Not defined