Find the nth term of the A.P. 's :
200, 195, 190, 185,.....

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Solution

$a = 200, a + d = 195 \Rightarrow d = - 5$

$∴$ $T_{n} = a + (n - 1) d$

$= 200 + (n - 1) (- 5)$

$= 200 - 5 n + 5 = 205 - 5 n$

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