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Look at the series of even natural numbers:

2, 4, 6, 8, 10, 12 ...

Now the positions of these numbers are:

1, 2, 3, 4, 5, 6..

If you match the position with corresponding natural number (eg. 1 with 2, 2 with 4 and so on) it looks like the corresponding Natural number is twice as the position number.

The answer is: 69 x 2 = 138

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11y ago

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