Asked by first name

An expression contains 26 terms, one for each letter of the alphabet. It starts
a + 4b + 9c + 16d + 25e + … Another expression containing 26 terms starts a + 2b + 4c + 8d + 16e + … What is the sum of all
the coefficients?
Answered by oobleck
the coefficients are just powers of 2, a geometric sequence.
Sn = a(2^n -1)/(2-1)
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