Find the 20th term from the last term of the AP : 3,8,13,.....,253.
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A.P=3,8,18....253
From last
a=253,d=8-3=5
New A.P 253,248.......3
20th term=a+19*d
253+19*(-5) as we are taking reverse so it is -5
253-95
158
Therefore the 20th term from last is 158
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PonnuSachu:
:-)
thnx
from first. a1=3, a2 =8 , d=8-3 = 5 , then from last a1= 253 , d= -5 , a20 =a+19d , 253 +19(-5), 253-95= 158
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158 is Right answer.......
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