{1,3,5,7,9,11} find the subsets and proper subsets

Suppose a man is heterozygous for heterochromia, an autosomal dominant disorder which causes two different‑colored eyes in an individual, produced 25‑offspring with his normal‑eyed wife. of their children, 15 were heterochromatic and 10 were‑normal. calculate the chi‑square value for this observation.

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Which of the following is missing in the explicit formula for the compound interest geometric sequence below?