LAST TIME I POST THIS QUESTION Solve the triangle: α = 58°, a = 9, b = 15.
1 answer:
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Number of multiples of 7 up to 1337: 
Number of multiples of 11 up to 1337:
Number of multiples of 77 up to 1337:
This means there are
distinct multiples of 7 *or* 11 up to 1337.
The sum of these multiples is
which can be computed using the well-known formula,
So you have
Number of multiples of 11 up to 1337:
Number of multiples of 77 up to 1337:
This means there are
The sum of these multiples is
which can be computed using the well-known formula,
So you have