a) a=2, b=3, c=5, d=4
b) a=1, b=2, c=5, d=4
c) a=5, b=4, c=7,d=5
d) a=1, b=2, c=3, d=4
Answer: b
Explanation: The given prefix expression is evaluated as ((1+2)*5)-4 = 11 while a=1, b=2, c=5, d=4.
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