Find the missing number.
$10, 20, 10, 9, 21, 11, 8, 22, 12, . . . . .$

5

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7

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8

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11

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Solution

The correct option is B $7$
The above series is a mixture of 3 patterns.
(1) 10, 9, 8, 7,
(2) 20, 21, 22, 22
(3) 10, 11, 12, 13

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(2, 3), (5, 7), (11, 13), (17, 19),____

3 \times 5 \times 7 \times 8 = 5783, 9 \times 5 \times 3 \times 2 = 5329,

? \times ? \times 8 \times 5 = 2853

2, 5, 8, 11,

, 17, 20, 23, 26

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