book Maths Puzzle Numerical Ability

A couple plans to have three children. What is the probability of getting at least one girl? 7/8 1/8 1/2 3/4

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book Other Question

I am having trouble with this question, Find the lowest common denominator of p+3
----------
p^2+7p+10

and
p+5
----------
p^2+5p+6

Can someone please help me?
I need help on how to get the answer to this equation: Y=(2xÙ2 + 4x + 1)Ù5

and the answer they gave was y= 20(2x +4x +1)Ù4(x+1), do you think there was a typo somewhere??