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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 (9 years ago)

Unsolved Read Solution (4)

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Umabandekar  (9 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  (9 years ago)

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

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priyadarshan kumar  (8 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.

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Digesh Singh Bisht  (2 years 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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