# Arithmetic progression - examples

- Real estate

Residential house has three entrances numbered by odd numbers arithmetic progression. The sum of the two numbers on the corner entrances is 50. Calculate the highest of this three numbers. - Series

Andrew wrote this series of numbers: 1,3,7,15, .... n. Which number in the series does not belong? ? - Sequence

Write the first 7 members of an arithmetic sequence: a_{1}=8, d=-9. - AVG of INT

What is the average of the integers from 7 throuht 15 inclusive? - Sequence 3

Write the first 5 members of an arithmetic sequence: a_{7}=-51, a_{17}=-121. - Sequence 2

Write the first 4 members of an arithmetic sequence a_{15}=-24, d=-2 - Sequence

In the arithmetic sequence is a_{1}=-9, d=4. Which member is equal to the number 147? - Gauss

Help little C.F. Gauss sum all the integers from 1 to 340. - Octahedron - sum

On each wall of a regular octahedron is written one of the numbers 1, 2, 3, 4, 5, 6, 7 and 8, wherein on different sides are different numbers. For each wall John make the sum of the numbers written of three adjacent walls. Thus got eight sums, which also. - Sequence

Between numbers 2 and 78 insert n members of the arithmetic sequence that its sum is 600. - Ravens

The tale of the Seven Ravens were seven brothers, each of whom was born exactly 1.5 years after the previous one. When the eldest of the brothers was 4-times older than the youngest, mother all curse. How old was seven ravens brothers when their mother cur - Cinema

Cinema auditorium is built for 3591 people. The first row is planned for 39 seats and each next gradually 3 more. How many rows of seats will have auditorium? - Mailbox

Mailbox is opening at regular intervals 3 times a day. The first time is opened at 6:00 and the last at 16:00. Calculate hours when mailbox is opened during day. - Lines

In how many points will intersect 11 different lines, where no two are parallel? - Roof

Tiles are stacked in rows on the trapezoidal shaped roof. At the ridge is 15 tiles and each subsequent row has one more tile than in the previous row. How many tiled is covered roof if lowermost row has 40 tiles? - AS sequence

In an arithmetic sequence is given the difference d = -2 and a_{78}= 518. a) Determine the value of a_{67}b) Determine the sum of 78 members. - Angles in a triangle

The angles of the triangle ABC make an arithmetic sequence with the largest angle γ=69°. What sizes have other angles in a triangle? - Seats

Seats in the sport hall are organized so that each subsequent row has five more seats. First has 10 seats. How many seats are: a) in the eighth row b) in the eighteenth row - Cinema

How many rows of seats are in the stands, if you know that the first row has 24 seats and the last 50 seats and each subsequent row has two seats more than row before? How many seats are in the stands? - n-gon

Gabo draw n-gon, which angles are consecutive members of an arithmetic sequence. The smallest angle is 70° biggest 170°. How many sides have Gabo's n-gon?

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