Question

Find the number of terms in the A.P. : 18, 151/2, 13, ..., - 47.​

Answer 1

Answer:

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

hope it helps, if it does pls mark as brainliest

Answer 2

Answer:

plz check the question first then ask.

Step-by-step explanation:

AP = 18,151/2,13,.....,-47

d = 151/2-18 = 13-151/2

=> (151-36)/2 = (26-151)/2

=> 115/2 = -125/2 => which is impossible❌

d(common diff.) should be equal,then we can find the no. of term.