This is the Important question based on Arithmetic progression Chapter of R.S Aggarwal book for ICSE & CBSE
Board.
In this question you have to find the number of term on which the AP becomes zero.
This is the Question Number 10 Of Exercise 11 D of RS Aggarwal Solution.
Deepak BoraNewbie
Which term of the AP 21,18,15,….is zero?
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The given is in A.P.
⇔ 21,18,15
a=21
a+d=18
d = -3
⇒a(nth term)= a+(n-1)d
⇒0=a+(n-1)d
⇒0=21+[n-1](-3)
⇒n-1 = -21/-3
⇒n-1 = 7
⇒n =8.