Number, Ranking and Time Sequence Test Questions

Given Number:     4  2  1  5  7  9  3  6  8

Ascending order:  1  2  3  4  5  6  7  8  9

Hence the required pairs are  12, 49, 16

7  4  2

7  4  6

7  4  1

7  4  6

Only at these placees 4 is preceded by 7 but not followed by 3

Clearly, A’s new position is 15th from the left. But this is the same as B’s earlier position which is 9th from the right.

Number of students in class = (8 + 1 + 37) = 46

Number students behind the nitin in rank = (49 - 18) = 31

Nitin is 32nd from the last

Number of boys in the class = (18 + 1 +18) = 37

Three persons A, B, C can be arranged in a queue in six different ways, ie ABC, CBA, BAC, CAB, BCA, ACB. But since there are only 3 persons ahead of C, so C should be in front of the queue. Thus, there are only two possible arrangements, ie CBA and CAB.

We may consider the two cases as under:

Case I:  ←3C↔8B↔5A→21

Clearly, number of persons in the queue = (3+1+8+1+5+1+21=) 40

Case II:  ←3C A↔5B

Number of persons between A and C                  

= (8 - 6) = 2   

∵[C↔8B A→21B]

Clearly number of persons in the queue = (3+1+2+1+21) = 28

Now, 28 < 40. So, 28 is the minimum number of persons in the queue.                                                     

Given Number : 7346285

Ascending Number : 2345678

Answer is Two. Those digits are 3,4