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Q.

Total number of ways in which six ‘+’ and four ‘–’ signs can be arranged in a row so that no two ‘–’ signs to be together, is

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a

35

b

70

c

6!×4!

d

24

answer is A.

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Detailed Solution

Six ‘+’ signs can be arranged in only 1 ways in 7 gaps,4 ‘-’ signs can be arranged in=7p44! ways =1×7p44!=35
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