6 , 20 , 72 , ? , 1056
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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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