1)
n=C⁴₇=7!/(4!·3!)=35
m=C₃²·C₂²=3·1
p=m/n=3/35
2)
n=C⁶₁₂=12!/(6!·6!)=924
m=2·C₂²·C₁₀⁴=420
p=m/n=420/924=5/11
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Verified answer
1)
n=C⁴₇=7!/(4!·3!)=35
m=C₃²·C₂²=3·1
p=m/n=3/35
2)
n=C⁶₁₂=12!/(6!·6!)=924
m=2·C₂²·C₁₀⁴=420
p=m/n=420/924=5/11