Question

find the 18th term of an arithmetic progression:- 4,9/2,5,11/2,.....​

Answer 1

Answer:

a18 = 25/2

Step-by-step explanation:

GINEN:-

a1 = 4

a2 = 9/2

a3 = 5

a4 = 11/2

TO FIND:- a18

SOLUTION:-

First find d

d or common difference = a2-a1

d = 9/2 - 4

LCM = 2

d = (9-8)/2

So, d = 1/2

Now, we know that a18 = a+17d

Here, a means a1

d = 1/2

So, putting the values , we get,....

a18 = 4 + 17×1/2

a18 = 4+17/2

LCM = 2

So, it beconed,....

a18 = (8+17)/2

a18 = 25/2

So, a18 = 25/2 is the answer....

Hope it helps....

Answer 2

Step-by-step explanation:

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