maverickjin8 wrote:

In a certain sequence of numbers, each term after the first term is found by multiplying the preceding term by 2 and then subtracting 3 from the product. If the 4th term in the sequence is 19, which of the following numbers are in the sequence? Indicate all such numbers.

A.5

B.8

C.11

D.16

E.22

F.35

The answer is a,c,f

I don't know how to solve this in a proper way.

Let the first term be \(x\). then the series is....

\(X\), \(2X -3\), \(4X - 9\), \(8X - 21\)

8X -21 =19

8X =40

X =5

So putting X =5 the series is 5, 7, 11, 19, 35, 67...............

So 5, 11 and 35..

PS: this question is very strangely worded! Can you share the source?

_________________

Sandy

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