Difference between revisions of "AMC 12C 2020 Problems"
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Let <math>R(x)</math> denote the number of trailing <math>0</math>s in the numerical value of the expression <math>x!</math>, for example, <math>R(5) = 1</math> since <math>5! = 120</math> which has <math>1</math> trailing zero. What is the sum | Let <math>R(x)</math> denote the number of trailing <math>0</math>s in the numerical value of the expression <math>x!</math>, for example, <math>R(5) = 1</math> since <math>5! = 120</math> which has <math>1</math> trailing zero. What is the sum | ||
− | <math>R( | + | <math>R(20) + R(19) + R(18) + R(17) + … + R(3) + R(2) + R(1) + R(0)</math>? |
+ | |||
+ | <math>\mathrm{(A) \ } -12\qquad \mathrm{(B) \ } 0\qquad \mathrm{(C) \ } 5\qquad \mathrm{(D) \ } 16\qquad \mathrm{(E) \ } 24</math> | ||
==Problem 10== | ==Problem 10== | ||
In how many ways can <math>10</math> candy canes and <math>9</math> lollipops be split between <math>8</math> children if each child must receive atleast <math>1</math> candy but no child receives both types? | In how many ways can <math>10</math> candy canes and <math>9</math> lollipops be split between <math>8</math> children if each child must receive atleast <math>1</math> candy but no child receives both types? |
Revision as of 18:33, 21 April 2020
Contents
Problem 1
What is the sum of the solutions of the equation ?
Problem 2
What is the numerical value of the sum
Problem 3
In a bag are marbles consisting of
blue marbles and
red marbles. If each marble is pulled out
at a time, what is the probability that the
marble pulled out red?
Problem 4
cows can consume
kilograms of grass in
days. How many more cows are required such that all the cows together can consume
kilograms of grass in
days?
Problem 5
A lamb is tied to a post at the origin on the real
plane with a rope that measures
units.
wolves are tied with ropes of length
as well, both of them being at points
, and
. What is the area that the lamb can run around without being in the range of the wolves?
Problem 6
How many increasing(lower to higher numbered) subsets of contain no
consecutive prime numbers?
Problem 7
Let denote the sum of the factors of a positive integer
. What is the sum of the
least possible values of
such that
?
Problem 8
The real value of that satisfies the equation
can be written in the form
where
and
are integers. What is
?
Problem 9
Let denote the number of trailing
s in the numerical value of the expression
, for example,
since
which has
trailing zero. What is the sum
?
Problem 10
In how many ways can candy canes and
lollipops be split between
children if each child must receive atleast
candy but no child receives both types?