Question

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

Answer 1

See 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)`

Answer 2

multiplies by 4 then divides by 2

Explanation: