durham953
31.03.2020 •
Mathematics
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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Ответ:
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
Ответ:
the answer is 25 so yeah