MBA Exam

There are four sections A, B, C and D in a school. If the pass percentage of sections A, B and C is 50%, that of sections A, B, D is 55%, that of A, C, D is 60% and that of B, C, D is 65% then which of the following can be the pass percentage of sections A, B, C and D combined together.

1) 56.33
2) 54.67
3) 53.33
4) 52.67

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MBA Other Question
the 4800th term of the sequence1,3,3,3,5,5,5,5,5,7,7,7,7,7,7,7,9......approach pls explain???

1) 137
2) 138
3) 139
4) 140
 how many three digit no's taken from left to right are in the form of AP or GPshare approach plz !

1) 15
2) 18
3) 20
4) NOT