Find the 20th term from the end of the AP:3,8,13,......253
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AP is 3, 8 , 13 ,............253
253...........13, 8, 3
a=253
d= - 5
20th term = a + (n-1)d
253 + 19. -5
253 - 95
158
253...........13, 8, 3
a=253
d= - 5
20th term = a + (n-1)d
253 + 19. -5
253 - 95
158
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