8. Arithmetic Sequences
• Is a sequence in which the difference
between any two consecutive terms is
the same.
• The constant difference is called the
common difference.
15. Example
• An object is falling from the rest travels
16 ft. during the first second, 48 ft.
during the 2nd
second, 80 ft. during the
third second, and so on. How far does the
object fall
a. during the 7th
second,
b. after 7 seconds
17. Solve each problem
1. Find the 23rd
term of the sequence 5.7,
3.6, 1.5, …
2. If the 3rd
term of an arithmetic sequence
is 13 and the 9th
term is 37, what is the
common difference?
3. If form an arithmetic sequence, find x
and 5th
term.
18. Solve each problem
4. Find the 10th
term of the sequence -37, -
34, -31,…
5. Find the value of x, if
32. Example
How many three digits even number can
be formed using 0, 1, 2, 3?
Solution.
100, 102, 110, 112, 120, 122, 130, 132,
200, 202, 210, 212, 220, 222, 230, 232,
300, 302, 310, 312, 320, 322, 330, 332.
33. Fundamental Principle of counting
if one event can occur in m ways, and
another event can occur in n ways, then
these events can occur in mn ways,
provided that the two events are
independent events.
34. Example
Two independent events are formed from
the digits 0,1,2,3,4,5,6,7,8,9.
a. How many two digits numbers can be
formed ?
b. How many of these are even?
c. How many of these are odd?
d. How many of these are divisible by 3?
35. Example
A cell phone service provider offers two
free smart phone app. If there are 24
different apps to choose from, how many
different combination of the two apps a
client have?
36. Exercise
Give the number of possible outcomes.
1. Tossing a coin three times
2. Rolling a yellow die and a red die
3. Choosing a book to read from 7 fiction
and 9 non-fiction
4. The number of ways a student can wear
his 6 shirts, 4 pants, and 2 shoes.
38. Exercise
1. How many 2-digit numbers can be
formed from the four integers 1,2,3, and
4 if repetition is allowed?
2. If a coin is flipped 4 times, how many
different sequences of heads and tails
are possible?
39. Exercise
3. How many ways can a postman posts 3
letters in 5 letter boxes?
4. A mall has five gates. How many ways
can one enter and exit the mall?
40. Quiz Time!
1. If two dice are rolled, how many
outcomes are there? How many of these
have a dot sum greater than 8? Less
than 10?
2. How many three digit numbers less than
150 can be formed from the digits
0,3,4,6 and 9?
41. Permutation
Permutation refers to an arrangement of
objects in a definitive order. Changing the
order of the objects being arranged creates
a new permutation.
44. Task
Create a presentation showing the
computation of probability of winning in
gambling games such as lotto, roulette, etc.
45. Example
Eight students are lined up to be seated.
a. how many ways can 4 of them be
seated in a row of 4 chairs?
b. How many ways can all of them be
seated in a row of 8 chairs?
46. Permutation with repetition
The number of permutation of n object of
which p are alike, q are alike, r are alike,
and so on is
47. Example
How many different ways can a letter of the
following words be arranged?
a. QUEZON
b. PANGASINAN
c. MANILA
d. TAGAYTAY