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What's the rule of 1 * 2 * 3 * 4 + 1 = 24 + 1 = 5 * 5 2 * 3 * 4 * 5 + 1 = 120 + 1 = 11 * 11 3 * 4 * 5 * 6 + 1 = 360 + 1 = 19 * 19
(n+1)(n+2)(n+3)(n+4)+1=(n^2+5n)^2
1/4+4/7+7/10+10/13+13/16+16/19=?
4 * 7 * 10 * 13 * 16 * 19 = denominator = 1106506
Divide this denominator by the original denominator, multiply by the original numerator, and then add them separately. That's the answer you want
The number is too big. The mental arithmetic is not as good as that one
Just find a calculator and press it
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