Which term of the $A P = 72, 68, 64, 60,$ ...is 0?

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Solution

given AP is 72,68,64.....

a=72,d=-4

nth term, $a_{n} = a + (n - 1) d$

nth term is 0

0=72+(n-1)-4

-72=(n-1)-4

n-1=18

n=19

therefore,the 19th term of given AP is 0

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