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Question

Question 5 (ii)
Find the number of terms in each of the following A.P.
(ii) 18,1512,1347

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Solution

(ii)
For this A.P,a=18d=a2a1=151218d=31362=52Let there are n terms in this A.P.an=47an=a+(n1)d47=18+(n1)(52)4718=(n1)(52)65=(n1)(52)(n1)=1305(n1)=26n=27Therefore, this given A.P. has 27 terms in it.

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