find the 20th term from last term of the AP 3,8,13,.....,253
Answers
Answered by
96
Solution :
We have, l = Last term = 253
and,
d = Common difference = 8 - 3 = 5
∴ 20th term from the end = l - (20 - 1)d
= l - 19d
= 253 - 19 × 5
= 253 - 95 = 158
Answered by
43
a20=?
from last term so the AP becomes 253........,13,8,3
now, a=253
d=8-13 =-5
an=a+(n-1)d
a20=253+(20-1)-5
=253+19(-5)
=253-95
=158
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