exam Maths Puzzle Numerical Ability

6*5+2-24 divded by 4*2

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Would you help me with this problem: the quotient of -18 and 1/6 is find the sum of the geometric series
6
[SUM] 2^n
n=1


n=1 2^1=2
n=2 2^2=4
n=3 2^3=8
n=4 2^4=16
n=5 2^5=32
n=6 2^6=64
2+4+8+16+32+64= 126

am I doing this correctly?