The answer is 50/50. The either child is a boy or a girl. 50/50 chance
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For the first 60 positive integers, a = 1, n = 60, l = 60.
Sn = n/2(a + l)
s = 60/2(1 + 60) = 30(61)
For the next 60 positive integer, a = 61, n = 60, l = 120
Sum = 60/2(61 + 120) = 30(61 + 120) = 30(61) + 30(120) = s + 3600
Sum of first 120 positive integers = s + s + 3600 = 2s + 3600
This is the associative property, since any numbers can <em>associate </em>with each other, via the parentheses.
The answer is 367,500 yards
