The 20th term of given A.P 7 ,13 ,19, ............205 from its last term is
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Step-by-step explanation:
A.P. 7 , 13 , 19 , ...... , 205
a = 7
d = 13 – 7 = 6
An = 205
As we know,
An = a + (n–1) d
205 = 7 + (n–1) 6
=> 205 – 7 = (n–1) 6
=> 198 = (n–1) 6
=> n–1 = 198 / 6
=> n–1 = 33
=> n = 33 + 1
=> n = 34
Thus, total no. of terms is 34.
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