Question

6 , 20 , 72 , ? , 1056​

Answer 1

Given : 6 , 20 , 72 , ? , 1056​

To Find : Missing number

Solution:

6

6 x 4  - 2²   = 20

20 x 4 - 2³ = 72

72 x 4 - 2⁴  = 272

272 x 4 - 2⁵  = 1056

Sequence is

Tₙ  = Tₙ₋₁ x 4  - 2ⁿ

Hence missing number is 272

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