Posted by Amir khan on Sunday, September 25, 2011 at 7:34am.
1) The first term of arithmetic progression is 20 and the sum of it's term is 250. find it's last term if the number of it's terms is 10
2) Find the fifth term from the arithmetic progression 12, 9, 6 hence find the sum of it's first fifty terms.
3) The sum of the first terms in Arithmetic progression is equal to 24, and the sum of the last six terms equal to 30. if the number of it's term is 12. find a) it's common different
b) The first term
c) the last term

maths  Anonymous, Tuesday, January 24, 2012 at 4:09am
Answer

maths  ari, Thursday, January 30, 2014 at 2:40am
3)a=12
d=3
t(5)=a+(n1)d
=12+(51)3
=0
s(50)=3625
hope it would be a help. :)

maths  Iddrisu Toarik, Thursday, November 13, 2014 at 11:28am
U2= a=8/9 U2=8/9 Un= arn1 if n=2 U2= arn71 8/9=2(r6)

maths  adjei, Thursday, September 24, 2015 at 8:25am
1) a=20
Sn=250
. n=10
Sn=n/2(2a+(n1)d)
250=10/2(2(20)+(101)d)
250=5((40)+(9)d)
250=200+45d
250+200=45d
d=10
Un=a+(n1)d
Un=20*(101)10
Un=20+900
Un=880
::the last term=880

maths  adjei, Thursday, September 24, 2015 at 8:40am
2) a=12
. Un=6
d=3
n=5
S5=5/2(2(12)+(51)3)
2.5(24)+12)
. 2.5(36)
S5=90
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