Total no. Of ways in which 6 '+' and 4 '-' signs can be arranged in a row so that no 2 '-' signs to be together is?
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Six + signs can be arranged in 1 way.
4 negative signs can be arranged in between, beginning and ending, all of together 7 places in P(7,4)/4! Ways. =35 ways.
4 negative signs can be arranged in between, beginning and ending, all of together 7 places in P(7,4)/4! Ways. =35 ways.
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