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3. If the common difference of an AP is 3, then what is a18-a13

By Julia

3. If the common difference of an AP is 3, then what is a18-a13

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Julia

Without solving, comment upon the nature of the roots of the following :
[tex]x { }^{2} – ax – b {}^{2} = 0[/tex]
​

What will happen if all animals started eating the same type of food?​

1 thought on “3. If the common difference of an AP is 3, then what is a18-a13”

  1. Answer:

    Given, common difference of the AP,

    d=5

    We know that,

    a

    n

    =a

    1

    +(n−1)d

    Then,

    a

    18

    =a

    1

    +17×d

    a

    13

    =a

    1

    +12×d

    Solving the two equations,

    a

    18

    −a

    13

    =a

    1

    +17d−a

    1

    −12d

    a

    18

    −a

    13

    =5d,

    Substituting d=5,

    a

    18

    −a

    13= 25

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