How many positive integers less than 100 are there such that they are multiples of 8 or multiples of 7 but not both?
Choose the correct choice from the following answers:
A) 21	B) 22	C) 25	D) 24	E) 31
for 8: 8...100=8*12   for 7: 7...98=7*14   but there is one integer 8*7. so   N=(12-1)+(14-1)= 
<gadget id="calculator">(12-1)+(14-1)</gadget>
<output>24</output>
24   24
<result>D</result>
How many positive integers less than 100 are there such that they are multiples of 8 or multiples of 7 but not both?