Permutations and Combinations 3 Question 13

13. Total number of ways in which six ’ + ’ and four ’ - ’ signs can be arranged in a line such that no two ‘-‘signs occur together is… .

(1988,2M)

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Answer:

Correct Answer: 13. (35 ways)

Solution:

  1. Since, six ’ + ’ signs are ++++++

4 negative sign has seven places to be arranged in

7C4 ways =35 ways 



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