Question

Identify the pattern rule for this sequence: 20, 80, 40, 160, 80, 320…

Answer 1

Answer:

multiplies by 4 then divides by 2

Step-by-step explanation:

Answer 2

Answer:

See step by step.

Step-by-step explanation:

20 * 4 = 80

80 / 2 = 40

40 * 4 = 160

160 / 2 = 80

80 * 4 =320

if x is Nth number in the sequence:

if N is odd:

$x = 20 * 4^{(N-1)/2} / 2^{(N-1)/2}$

if N is even:

$x = 20 * 4^{(N)/2} / 2^{(N)/2-1}$