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15-02-2017
Mathematics

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How many numbers between 40 and 129 are equal to 6 times an integer

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Аноним Аноним

15-02-2017

Here, the series would be: 42, 48 .... 126
an = a + (n - 1)d
126 = 42 + (n - 1)6
126 - 42 = 6n - 6
84 + 6 = 6n
n = 90/6
n = 15

In short, Your Answer would be 15

Hope this helps!

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