Total number of ways of selecting 1 from junior and 1 from senior =
1000 C 1 * 800 C 1 = 1000 * 800
As there are 60 sibling PAIRS,
Number of ways of selecting 1 from junior and 1 from senior so that they are Sibling pair = 60 C 1 * 60 C 1 = 60 * 60
Required probality = Number of favorable events / total number of events
= (60 * 60 ) / (1000 * 800 )
= 9 / 2000
Please let me know the OA
1000 C 1 * 800 C 1 = 1000 * 800
As there are 60 sibling PAIRS,
Number of ways of selecting 1 from junior and 1 from senior so that they are Sibling pair = 60 C 1 * 60 C 1 = 60 * 60
Required probality = Number of favorable events / total number of events
= (60 * 60 ) / (1000 * 800 )
= 9 / 2000
Please let me know the OA
