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https://www.physicsforums.com/threads/in-discrete-math-adv-counting-techniques-see-picture-h.882371/

somehow forum disabled comments so created new post:

basically is easy to take the problems given recursive formula, find a, b, d, c and replace but how to the math for

a^k

g(n/b^j)

f(n) = a^k ... g(n/b^j)

k get n how?

g(n/b^j) how get j dependence so solve the summation.... n what becomes?

finally i want a f(n)...