How many positive integers less than 1000


How many positive integers less than 1000?

a) have distinct digits

b) have distinct digits and are even

c) divisible by 7

d) divisible by 7 and not 11

c) both 7 and 11

d) either 7 or 11

e) exactly one of 7 or 11

f) neither 7 or 11

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