How to answer these questions ?

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1 Answer
Feb 24, 2018

x = 15 for an AP

x=9 for a GP

Explanation:

a) For an AP, the difference between consecutive terms is equal we just need to find the average of the terms on either side,

(3+27)/2 = 15

b) Since both 3 (3^1) and 27 (3^3) are powers of 3, we can say that they form a geometric progression with a base of 3 and a common ratio of 1.

Therefore the missing term is simply 3^2, which is 9.