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5 March, 13:01

1,6,15,?, 45, 66, 91

a. 25

b. 26

d. 28

c. 27

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Answers (1)
  1. 5 March, 16:29
    0
    d. 28

    Step-by-step explanation:

    The pattern is like this : add 5,9,13,17,21,25

    so you need to add 13 to 15

    and I believe you are missing a number
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