Question

find the number of terms in the AP

18, 151/2, 13,------,-47

Answer 1

Her, a=18.,d=-5/2

Tn=a+(n-1)d

=>-47=18+(n-1)-5/2

=>5n/2=18+47+5/2=67.5

=>n=27.

Hence,it is 27th term

Hope it helps

Answer 2

Answer:

Step-by-step explanation:

Let us first check if it is an AP,

in an ap, a3-a2 = a2-a

a = 18

a2 = 151/2

a2-a = 151/2 - 18

= 151- 36/2

d1 = 115/2

a3 = 13

a3-a2 = 13 - 151/2

= 26 - 151/2

= -125/2

therefore, a3-a2 = a2-a

hence the given sequence is not an ap.

hence we cannot find the number of terms using an ap formula

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