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in an arthmetic progression or

find the sum of arthmetic progression 12,15,18,,,,,, 84,a=12 d=3 n=?
1. 2 answers
2. asked by sonia
3. 362 views
the first term of an arthmetic progression is 1 and its last term is 28, find the sum of the progression if their number is 10
1. 1 answer
2. asked by sonia
3. 483 views
The sum of the first 5 terms of an arthmetic sequence, is 30 and the sum of the next 4 terms is 69 .Find the arthemetic
1. 3 answers
2. asked by Abdela
3. 541 views
in an arthmetic progression or series,the 13th term is 27 and the 7th iterm is 3 times the 2nd term ,find first term the common
1. 1 answer
2. asked by Anonymous
3. 595 views
5 times the 5th term of arthmetic progression is equa to 10 times the 10th term. Find the common difference and the first term
1. 1 answer
2. asked by Aphrodis
3. 622 views
The 9th term of an arithmetic progression is 4+5p and the sum of the four terms of the progression is 7p-10, where p is a
1. 1 answer
2. asked by Watermelon
3. 911 views
The first, the third and the seventh terms of an increasing arithmetic progression are three consecutive terms of a geometric
1. 4 answers
2. asked by kudu
3. 3,832 views
The 4th, 6th and 9th term of an arithmetical progression form the first three times of a geometric progression. If the first
1. 5 answers
2. asked by Stanley
3. 526 views
In an infinite geometric progression with positive terms and with a common ratio |r|<1, the sum of the first three terms is 26/3
1. 1 answer
2. asked by Alex Chien
3. 1,175 views
The third, fifth and seventeenth terms of an arithmetic progression are in geometric progression. Find the common ratio of the
1. 1 answer
2. asked by Gustav
3. 2,155 views