MBA Exam

If a and b are real numbers such that
a^a^b= b and a ≠ b , then what is the value of a^b – b?a)0b)1c)2d)-1please post the solution also

1) o
2) 1
3) 2
4) -1

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MBA Other Question

Two circles with centers C1 and C2 having radii 12 cm and 3 cm respectively touch each other at a point A. AB is a common tangent to the circles which intersects another common tangent CD at the point B as shown in the figure given below. What is the length of the line segment AB?

1) 10
2) 7.5
3) 6
4) 9
5) 5
In an examination ,80% student passed in physics ,70% in chemistry while 15% failed in both the subject.if 325 students passed in both the subjects.Find the total no. of student who appeared in the examination.

1) 500
2) 400
3) 300
4) 600