Solution for q. in a group of 28 persons , 9 take tea but not coffee and 16 take tea . how many take coffee but not tea
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Total person= 28
Person who take tea but not coffee = 9
Person who take tea = 16
person who take tea and coffee both = 16 - 9
= 7
so
n ( T ) = 16
n ( C ) = ?
n ( T intersection C ) = 7
n ( T U B ) = 28
n ( T U B ) = n ( T ) + n ( C ) - n ( T intersection C )
28 = 16 + n ( C ) - 7
28 = 23 + n ( C )
n ( C ) = 5
Person who take tea but not coffee = 9
Person who take tea = 16
person who take tea and coffee both = 16 - 9
= 7
so
n ( T ) = 16
n ( C ) = ?
n ( T intersection C ) = 7
n ( T U B ) = 28
n ( T U B ) = n ( T ) + n ( C ) - n ( T intersection C )
28 = 16 + n ( C ) - 7
28 = 23 + n ( C )
n ( C ) = 5
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