Permutation and CombinationMedium
Question
Consider all permutations of digits 1,2,3.....9 such that sum of digits between -
(i) 1 and 2 (including 1 and 2) is 12 (ii) 2 and 3 (including 2 and 3) is 23
(iii) 3 and 4 (including 3 and 4) is 34 (iv) 4 and 5 (including 4 and 5) is 45
then fourth digit from left may be-
(i) 1 and 2 (including 1 and 2) is 12 (ii) 2 and 3 (including 2 and 3) is 23
(iii) 3 and 4 (including 3 and 4) is 34 (iv) 4 and 5 (including 4 and 5) is 45
then fourth digit from left may be-
Options
A.6
B.7
C.8
D.9
Solution
Only possible permutations are
472918365 and 563819274
472918365 and 563819274
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