Which term of the $A P : 88, 84, 80,$ .......is zero?

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Solution

$a = 88, d = - 4$
$a + (n - 1) d = 0$
$88 + (n - 1) (- 4) = 0$
$88 - 4 n - 4 = 0$
$4 n = 92$
$n = 23$
$23^{r d}$ term of the given series is zero

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