Find 5he 20th term from the last term of the ap:3,8,13.......263
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3,8,13,......263
263,.....13,8,3
so a=263 ,d=8-13= -7
a20=a +(n-1)d
a20 = 263 +(20- 1) (-7)
=263+ (19)(-7)
=263+(-133)
=263 - 133
=130
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