Find the 20th term from the last teen of the AP 3,8,13..........253
Answers
Answered by
0
first find the tn of 253. when you get it minus 20. then by tn find the n term
rashmidesai:
tn means last term.
here last term is 253
Ya I know
But tn=a+(n-1)d
We don't know :'n' how we can find it
tn means last term
And what does the sn mean?
sn means sum of the terms or number
How and when we have to use it
when we have to find sum of some terms or number
Answered by
2
Answer
a=3
d=5
tn = 253
by using formula
tn=a+(n-1)d
253=3+(n-1)5
253-3=(n-1)5
250=(n-1)5
250÷5=(n-1)
50=(n-1)
n=50+1
n= 51
the 20th term is 51
The it was helpful to me
Thx
welcome
Similar questions