Latest Elitmus Aptitude Question SOLUTION: 1,2,3,4,5,6,7 are arranged in order of sum of consecutive numbers is prime number,how many ways we can arrange

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(#M40154093) ELITMUS Logical Reasoning question 11/10/15 Keep an EYE

1,2,3,4,5,6,7 are arranged in order of sum of consecutive numbers is prime number,how many ways we can arrange

Asked In Elitmus K KRISHNA PRASAD NAIDU (8 years ago)

Unsolved Read Solution (4)

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Umabandekar  (8 years ago)

ans 5 ways.

Explanation:
1+2 = 3 (Prime no)
2+3 =5 (Prime no)
3+4 =7 (Prime no)
5+6 =11 (Prime no)
6+7 =13 Prime no)

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priyanka  (8 years ago)

didn't get the question.. can anyone please explain..

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priyadarshan kumar  (7 years ago)

( Ans is: 22 ways )

and the arrangements are:

1 2 3 4 7 6 5
1 2 5 6 7 4 3
3 2 1 4 7 6 5
3 2 5 6 7 4 1
5 2 1 6 7 4 3
5 2 3 4 7 6 1
1 6 5 2 3 4 7
1 6 7 4 3 2 5
5 6 1 2 3 4 7
5 6 7 4 1 2 3
5 6 7 4 3 2 1
7 6 1 4 3 2 5
7 6 5 2 1 4 3
7 6 5 2 3 4 1
1 4 3 2 5 6 7
1 4 7 6 5 2 3
3 4 1 2 5 6 7
3 4 7 6 1 2 5
3 4 7 6 5 2 1
7 4 1 6 5 2 3
7 4 3 2 1 6 5
7 4 3 2 5 6 1

here we take any arrangement and add any two consecutive numbers of that arrangement we get prime number

ex. 1 2 3 4 7 6 5
the sum of two consecutive number from this is

1 + 2 = 3
2 + 3 = 5
3 + 4 = 7
4 + 7 = 11
7 + 6 = 13
6 + 5 = 11

every time we get the prime number
similarly in other arrangements also we get the prime number if we add two consecutive numbers of that arrangemet.

Is this solution Helpfull? Yes (1) | No (3)  

Digesh Singh Bisht  (1 year ago)

Question is not clear. Tell us how many digits are there in a number. (2 digit number or 3 digit number or.........)

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