How many 7’s are there in the following series which are not immediately followed by 3 but immediately preceded by 8?
8 9 8 7 6 2 2 6 3 2 6 9 7 3 2 8 7 2 7 7 8 7 3 7 7 9 4
Answer: C
Correct answer: 2
Two 7s have an 8 immediately before them and something other than 3 after them: 8 7 6 and 8 7 2. The 7 in 8 7 3 is ruled out by the 3 that follows. So there are 2.
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How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?
Answer: D
Correct answer: Three
Writing 421579368 in ascending order gives 123456789, and comparing the two, three pairs of digits keep the same number of digits between them in both arrangements. So the answer is three.
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In a row, Kumar is at 7th place from the left and Pawan is at 9th place from the right. When they interchange the positions Kumar becomes 11th from left. How many were seated in the row ?
Answer: A
Initialy from left 7th = kumar
from right 9th = pawan
Interchange kumar = 11th from left, from right kumar = 9th;
11+8 = 19;
8 is 1,2,3,4,5,6,7(pawan),8,9,10,11(kumar),12,13,14,15,16,17,18,19;
simply count the 9th place from right we will get total as 19.
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In a row of 74 girls, Shweta is 27th from left end. Palak is 7th to the right of Shweta. What is Palak's position from the right end of the row?
Answer: B
Correct answer: 41
Palak stands seven places to the right of Shweta’s 27th, so she is 34th from the left. In a row of 74 that makes her \[ 74 - 34 + 1 = \mathbf{41} \text{st from the right} \]
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In the following set of numbers, if 1 is added to the last digit and then the orderr of digits is reversed, which number will be fourth if arranged in ascending order?
567 284 696 865 738
Answer: A
Here the given numbers are
567 284 696 865 738
When 1 is added to the last digit of each of the above numbers, it becomes as follows :
568 285 697 866 739
After reversing the order of digits , we get
865 582 796 668 937
Now , when the numbers are arranged in ascending order their order becomes as follows:
582 668 796 865 937
Hence , the fourth number is 865 (a number formed by 567). Therefore option(1) is correct answer.
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In the following list of numerals, how many 2’s are followed by l’s but not preceded by 4?
4 2 1 2 1 4 2 1 1 2 4 4 4 1 2 2 1 2 1 4 4 2 1 4 2 1 2 1 2 4 1 4 2 1 2 4 1 4 6
Answer: C
Correct answer: Four
Going through the list, four of the 2s are immediately followed by a 1 and are not immediately preceded by a 4. The rest fail one test or the other - either a 4 stands before them or something other than 1 follows. So the answer is four.
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Rajan is sixth from the left end and vinay is tenth from the right end in a row of boys. If there are eight boys between Rajan and Vinay, how many boys are there in the row ?
Answer: A
Correct answer: 24
Rajan is 6th from the left, eight boys stand between him and Vinay, and Vinay is 10th from the right, so the row holds \[ 6 + 8 + 10 = \mathbf{24} \] boys.
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In a row of people Manu is 7th from bottom end of row. Shrey is 10 ranks above Manu. If Shrey is 8th from top end, then how many people are there in this row?
Answer: D
Correct answer: 24
Shrey is 8th from the top and Manu ten ranks below him, so Manu is 18th from the top. Manu is also 7th from the bottom, so the row holds \[ 18 + 7 - 1 = \mathbf{24} \] people.
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In a row of boys, Rahul is 19th from top and Ajay is 21st from bottom. They interchange their position. Ajay now becomes 28th from bottom. Howmany total boys are there in the row?
Answer: B
Correct answer: 46
After the exchange Ajay stands where Rahul stood, and he is then 28th from the bottom - so Rahul’s place was 28th from the bottom and 19th from the top: \[ 28 + 19 - 1 = \mathbf{46} \]
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In the number 76534218 each digit is replaced next digit, ie '1' is replaced by '2' , '2' is replaced by '3' and so on and then the digits are arranged in ascending order from left to right, which digit will be fifth from the left end?
Answer: A
Given Number : 7 6 5 3 4 2 1 8
New Number : 8 7 6 4 5 3 2 9
Ascending Order : 2 3 4 5 6 7 8 9
Fifth digit in the above ascending order arrangement is '6' . Hence option(1) is the correct answer.
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