Find the 20th term from the last of the AP 3,8,13……..253
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158 is the right answer
\xa03,8,13…….,253\xa0To find 20th term form the last term we consider the sequence as followsa = 253 and d = 3 – 8 = -5an\xa0= a + (n – 1)da20\xa0= a + (20 – 1)d = 253 + 19\xa0×\xa0(-5) = 253 – 95 = 158Hence, the 20th term from the last term is 158.
158
368