The value of (7-1 – 8-1) -1 – (3-1 – 4-1)-1 is:
(a) 44
(b) 56
(c) 68
(d) 12
Explanation: (7-1 – 8-1) -1 – (3-1 – 4-1)-1
= (1/7-1/8) -1 – (1/3-1/4)-1
= (1/56) -1 – (1/12) -1
= 56 – 12 = 44
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