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25 October, 10:04

The sum of the first three terms of A. P is 18 if the first term is 4 find their product

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  1. 25 October, 10:31
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    192

    Step-by-step explanation:

    The sum of the first 3 terms of the A. P is

    a + a + d + a + 2d = 18, that is

    3a + 3d = 18 ← substitute a = 4

    12 + 3d = 18 (subtract 12 from both sides)

    3d = 6 (divide both sides by 3)

    d = 2

    Thus the first 3 terms are

    4, 6, 8 and their product = 4 * 6 * 8 = 192
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