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Find 20th term from the end of an A.P. 3,7,11..... 407. |
Answer» 407 = 3 + (n - 1)4 n = 102 So, 20th term from end => m = 20 a102-(20-1) = a102-19 = a83 from the beginning. a83 = 3 + (83 + 1)4 = 331. |
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