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6 November, 21:00

The arithmetic sequences 1, 5, 9, 13, ... and 1, 8, 15, 22, ... have infinitely many terms in common. Calculate the sum of the first three common terms.

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Answers (2)
  1. 6 November, 21:17
    0
    87

    Step-by-step explanation:

    Sequence 1 has common difference of 4 and sequence 2 has 7

    The first terms are common

    We need a new sequence with common difference of:

    LCM (4,7) = 4*7=28

    So the next common term is 1+28 = 29 and the following one is 29+28 = 57

    Sum of 3 terms:

    1+29+57 = 87
  2. 6 November, 21:21
    0
    15

    24

    Step-by-step explanation:

    The first three common terms are:

    1, 5, and 9.

    1, 8, and 15.

    Add them to find the sum.

    1 + 5 + 9 = 15

    1 + 8 + 15 = 24
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