List

Advanced problem solving module 23

Summats Clear
problem

Summats clear

Age
16 to 18
Challenge level
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Find the sum, f(n), of the first n terms of the sequence: 0, 1, 1, 2, 2, 3, 3........p, p, p +1, p + 1,..... Prove that f(a + b) - f(a - b) = ab.
Be reasonable
problem

Be reasonable

Age
16 to 18
Challenge level
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Prove that sqrt2, sqrt3 and sqrt5 cannot be terms of ANY arithmetic progression.
Harmonically
problem

Harmonically

Age
16 to 18
Challenge level
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Is it true that a large integer m can be taken such that: 1 + 1/2 + 1/3 + ... +1/m > 100 ?