How many? 7-digit telephone numbers are possible if the firstdigit cannot be
eight and
?(a) only even digits may be? used?
?(b) the number must be a multiple of 10? (that is, it must endin? 0)?
?(c) the number must be a multiple of 1,000?
?(d) the first 2 digits are 92?
?(e) no repetitions are? allowed?
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