Find the 20th term from the last of the AP 3,8,13.....258
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Answered by
2
Answer: 258,.....,13,8,3 are in A.P.
a=258,d=3-8=-5
Now,
An=a+(n-1) d
A20=258+19(-5)
=258-95
A20=163
Answered by
1
Ap is 3,8,13.......253
Here
A=3
D=8-3=5
An=a+(n-1)d
= 258=3+(n-1)5
255=5(n-1)
(n-1)=55
n=56
Here
A=3
D=8-3=5
An=a+(n-1)d
= 258=3+(n-1)5
255=5(n-1)
(n-1)=55
n=56
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