Question
In: Advanced Math
How many 7-digit telephone numbers are possible if the first digit cannot be eight and (a)...
How many 7-digit telephone numbers are possible if the first digit cannot be
eight and
(a) only even digits may be used?
(b) the number must be a multiple of 10 (that is, it must end in 0)?
(c) the number must be a multiple of 1,000?
(d) the first 2 digits are 92?
(e) no repetitions are allowed?
Solutions
Colby Messinger answered 2 years agoRelated Solutions
a) How many 3-digit numbers are there? b) How many 3-digit numbers can you make with...
a) How many 3-digit numbers are there?
b) How many 3-digit numbers can you make with all three digits
different?
c) How many of the numbers is part b) are odd?
How many 4 digit numbers can be formed using only the numbers 3 2 7 6...
How many 4 digit numbers can be formed using only the numbers 3
2 7 6 5 4 9 if:
a) there are no repeats allowed?
b) the number is odd and no repeats allowed?
c) the number is greater than 4000 and no repeats are
allowed?
d) the number is greater than 4000 and repeats are allowed?
How many base 10 numbers have five digits? How many five digit numbers have no two...
How many base 10 numbers have five digits? How many five digit
numbers have no two consecutive digits equal? How many have at
least one pair of consecutive digits equal?
How many 10 digit decimal numbers contain: a-) exactly three 7’s ? b-) at most two...
How many 10 digit decimal numbers contain:
a-) exactly three 7’s ?
b-) at most two 7’s ?
c-) at least two 7’s ?
please explain when solving problems. thanks
Question1: How many of the 5-digit numbers that can be written with the numbers 1, 2,...
Question1: How many of the 5-digit numbers that can be
written with the numbers 1, 2, 3, 4 contain both numbers 1 and
2?
question2: 3 married couples shown as a1a2, b1b2, c1c2 want to sit
in a row. How many different ways can these married couples sit in
a row, without a husband and a wife from the same couple coming
together?
1. A) How many three-digit numbers are there for which the sum of the digits is...
1.
A) How many three-digit numbers are there for which the sum of
the digits is at least 25?
B) How many three-digit numbers can be formed if only odd
numbers are allowed to be re-used
Please combinatorics principles where applicable.
How many eight-digit positive integers have the sum of digits being even?
How many eight-digit positive integers have the sum of digits
being even?
how many five digit numbers include the digits 4 or 6 or both?
how
many five digit numbers include the digits 4 or 6 or both?
how many 4 digit numbers divisible by 5 can be formed from 0,1,3,5,7,9 if repetition is...
how
many 4 digit numbers divisible by 5 can be formed from 0,1,3,5,7,9
if repetition is not allowed and 0 and 1 Can not be next to each
other.
i can do the first part. there are 2 cases
case 1, the number ends in zero.
5 x 4 x 3 x 1. but i dont know how to account for the zero and
one not being able to be next to each other. i counted 12 possible
numbers that...
For a 3 digit code with distinct numbers. (0-9) How many combinations to get the code...
For a 3 digit code with distinct numbers. (0-9)
How many combinations to get the code (max)?
How many combinations if you remember the middle number is
1?
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