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21 September, 18:27

What number is needed to complete the pattern 66, 73, 13, 21, 52,_, 10, 20?

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  1. 21 September, 21:05
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    66,73 73-66=7

    13,21 21-13=8

    10,20 20-10=10

    the missing no. is 9 so

    52+9=61.

    the pattern is

    66,73,13,21,52,61,10,20
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