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
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the correct option is c
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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
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