Complete the series by finding the missing term from the given alternatives.
$80, 63, 72, 72, 64, 81, 56, ?$

96

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98

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89

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90

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Solution

The correct option is C $90$
There are two alternate series :
Series I : 80, 72, 64, 56 (following -8 pattern)
Series II : 63, 72, 81, 90 (following +9 pattern)

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