MBA Exam

Suppose that a and b are two integers, not necessarily distinct, chosen from the set S = 1, 2, 3, · · · , 200. What is the probability that the unit digit of 3a + 7b is 6‌

1) 5/16
2) 3/16
3) 3/17
4) 7/17
5) 3/13

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MBA Other Question
In a quadrilateral ABCD,

1) 1
2) 2
3) 3
4) 4
 In a circle,the height of the arc is 21cm and the diameter is 84 cm.Find the chord of 'half of the arc'.

1) 42cm
2) 45cm
3) None