Question

The first three terms of a sequence are 8, 'y' and 18. Find the positive value of 'y' so that the sequence is an arithmetic progression.
A) 26 B) 18 C) 12 D) 13

Answer 1

the correct option is c

Answer 2

Answer: D)13

Step-by-step explanation:

as the numbers 8,y and 18 are in ap

therefore, y is the arithmetic mean of 8 and 18

i.e, 8+18/2=y

Thus, y = 13