1.

The nth term of the A. P. 3, 8, 13, 18, ............ is 148. Find n

Answer»

The A. P. is 3, 8, 13, 18, ............ 

Let the nth term of the A. P. be 148. 

a = 3, d = 5 and t n = 148

t n = a + (n - 1) d

148 = 3 + (n - 1) 5

= 3 + 5n - 5 

∴ 5n = 148 + 2 = 150 

∴ n = 30 

∴ 30th term is 148.



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