which term of the AP : 3,8,13,18-…,is 78?​

Question

which term of the AP : 3,8,13,18…….,is 78?​

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Serenity 1 week 2021-10-04T16:10:40+00:00 1 Answer 0 views 0

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    2021-10-04T16:11:48+00:00

    Answer:

    AP : 3,8,13,18…….,is 78?​

    a1 = 3, a2=8, a3=13, a4=18

    d= a2-a1

    d= 8-3

    d=5

    an=78

    a1+ (n-1)d =78

    3+(n-1)5 = 78

    (n-1)5 = 78-3

    n-1 = 75/5

    n-1 = 15

    n=15+1

    n=16

    therefore there are 16 terms in the AP

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