exam Maths Puzzle Numerical Ability

If a couple plans to have ten children, how many gender sequences are possible?

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exam Other Question

8/5y-2/3=23-1/15y find the coefficients a,b,c.

log(7,(8x^6/y^4)) = a log(7,2) + b log(7,x) + c log(7,y).

I do not understand the form they are seeking.

I have come up with 6log(7,8)+log(7,