Sam M.

# Sequence and series

Let a = 111....1 (55 digits), b= 1+10+10^2..+10^4, c= 1+ 10^5 +10^10 + 10^15 +..... +10^50, then which of the following is correct :

1) a=b+c
2)a=bc
3) b=ac
4) c=ab

## 2 Answers By Expert Tutors

By: Understanding math via the real world. Victoria V.

tutor
Thanks, John.

I didn't notice that c went  up by powers of 5.  Thanks for clariying.
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04/02/16 Math Teacher: 20 Yrs Teaching/Tutoring Calculus, PreCalc, Alg 2, Trig John G.

c is actually 10000100001...100001 (51 digits)
so a is definitely biggest, but I think multiplying would be the way to go instead of adding.
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04/02/16

Sam M.

Can you please explain the adding c part again, you wrote c=100000 + 1000000, but c is 1+ 10^5 +10^10 + 10^15 +..... +10^50?
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04/02/16

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