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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Alka gupta Best Answer
ans 0.9
mam but these 19 people can sit among themselves in 19! ways and also 2 couples can sit together in 2! ways then why u took only 19 pls once tell
here we are counting total number of available places for these two person which are sit together...so that's why we consider 19 not 19!....and if both are change together then place doesn't change so we are not consider 2!