1.

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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