find 3rd term from last term of ap 5,2,_1---_49
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Answered by
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A.P---》-49,-46,-43.......5
a=-49
d=3
n=3
a3=a+2d
a3=-49+6
a3=-43
hope this helps u....
a=-49
d=3
n=3
a3=a+2d
a3=-49+6
a3=-43
hope this helps u....
pandu1412:
it's wrong..
how
is the last term minus???
thnx
yes the last term is -49 so obviously the 3rd term from last would be -43
glad to help yo..
thnxx
your most welcome
Answered by
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first we should find the number of terms
5,2,..-1.........-49
according to AP
a+(n-1)×d
No. of terms =5+(n-1)×-3
5-3n+3=-49
8-3n=-49
-3n=-49-8
-3n=-57
n=19
therefore the no.of terms is 19..
and
3rd term from the last ,
a+(n-1)×d
a=-49,n=3 and d=3
-49+(3-1)×3
-49+6
=-43 is the 3rd term from the last
5,2,..-1.........-49
according to AP
a+(n-1)×d
No. of terms =5+(n-1)×-3
5-3n+3=-49
8-3n=-49
-3n=-49-8
-3n=-57
n=19
therefore the no.of terms is 19..
and
3rd term from the last ,
a+(n-1)×d
a=-49,n=3 and d=3
-49+(3-1)×3
-49+6
=-43 is the 3rd term from the last
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