Question

Which term of the A.P.:
21, 18, 15, .... is zero?​

Answer 1

Answer:

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Step-by-step explanation:

Answer 2

Step-by-step explanation:

here, d= -3 , a=21 Tn=0

=>Tn=a+(n-1)d

=>0=21+(n-1)×-3

=>21= -3n+3

=>n= -6