IIT JEE Practice Question and Answer
7Q: 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? 6266 05b5cc7f2e4d2b41977751e93
5b5cc7f2e4d2b41977751e93- 1Nonefalse
- 2Onefalse
- 3Twofalse
- 4Threetrue
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Answer : 4. "Three"
Explanation :
Answer: D) Three Explanation: 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
Q: How many even numbers are there in the following sequence of numbers which are immediately followed by an odd number as well as immediately preceded by an even number? 8 5 8 6 7 6 8 9 3 2 7 5 3 4 2 2 3 5 5 2 2 8 1 1 9 3 1 7 5 1 1397 05b5cc7f2e4d2b41977751ea2
5b5cc7f2e4d2b41977751ea2- 12false
- 23false
- 34true
- 45false
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Answer : 3. "4"
Explanation :
Answer: C) 4 Explanation: We have to find out even number - even number - odd number sequence. 8 5 8 6 7 6 8 9 3 2 7 5 3 4 2 2 3 5 5 2 2 8 1 1 9 3 1 7 5 1 There are four such such even numbers: 6,8,2 and 8.
Q: What should come next in the following number series? 9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 7 6 5 4 3 2 1 1652 05b5cc7f2e4d2b41977751ea7
5b5cc7f2e4d2b41977751ea7- 19false
- 28false
- 37false
- 46true
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Answer : 4. "6"
Explanation :
Answer: D) 6 Explanation: Here the series is: 987654321, 87654321, 7654321, 65...
Q: Three persons A, B and C are standing in a queue. There are five persons between A and B and eight persons between B and C. If there be three persons ahead of C and 21 persons behind A, what could be the minimum number of persons in the queue? 5602 05b5cc7f2e4d2b41977751eac
5b5cc7f2e4d2b41977751eac- 141false
- 240false
- 328true
- 427false
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Answer : 3. "28"
Explanation :
Answer: C) 28 Explanation: 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.
Q: In a row of thirty boys, R is fourth from the right end and W is tenth from the left end . How many boys are there between R and W? 2469 05b5cc7f3e4d2b41977751eb6
5b5cc7f3e4d2b41977751eb6- 115false
- 216true
- 317false
- 4can't be determinedfalse
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Answer : 2. "16"
Explanation :
Answer: B) 16 Explanation: W = 10th from the left R = 4th from the right = (30 - 4 + 1= ) 27th from left No of boys between R and W = (27 - 10) - 1 = 16
Q: In a class of 50 students M is eighth from top. H is 20th from bottom. How many students are there between M and H? 1984 05b5cc7f3e4d2b41977751ebb
5b5cc7f3e4d2b41977751ebb- 122true
- 223false
- 324false
- 4can't be determinedfalse
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Answer : 1. "22"
Explanation :
Answer: A) 22 Explanation: M is 8th from the top. H is (50 - 20 + 1 =) 31 st from the top. Number of students between M and H = (31 - 8- 1=)22
Q: In a class of 180, where girls are twice the number of boys, Rupesh[a boy] ranked 34th from the top. If there are 18 girls ahead of Rupesh, how many boys are after him in rank? 2078 05b5cc7f3e4d2b41977751ec0
5b5cc7f3e4d2b41977751ec0- 145false
- 244true
- 360false
- 4can't be determinedfalse
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Answer : 2. "44"
Explanation :
Answer: B) 44 Explanation: No. of boys up to the 34th rank = 34-18 = 16 Total no of boys = 180x1/2+1 = 60 number of boys after the rank of Rupesh = 60 - 16 = 44