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21 December, 08:28

The second term of a AP is 18 and the fifth term is 486. Find the a; first term b; common ratio.

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  1. 21 December, 08:46
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    Hello,

    AP = arithmetic progression

    Step-by-step explanation:

    b + a = 18

    18 + 3a = 486 ⇔ 3a = 468 ⇔ a = 156

    b = 18 - a = 18 - 156 = - 138
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