The number of integers between 300 and 1100 which are divisible by either 7 or 13 but not both is
Multiples of 7 are {301,308 ................................1099} n=115
Multiples of 13 are {312,323,.................................1092} n = 61
Multiples of 91 are {364,455.................................1092} n= 9
Number of integers which are divisible by either 7 or 13 but not both is 115+61-2*9
=158
Hence B is the correct answer.
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