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49 member attended the party, 22 males, 27 females.The shake hands between male, female, male & female. total 12 people given shake hands, how many such kind of shake hands are possible?

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its's 12c2 because handshake can be in pair only and given that total 12 people given handshake so the answer will be 12c2 i.e. 66
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12!/(10!*2!)
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can u explain clearly.... ???
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TCS Other Question

Directions for Q. 1 to Q. 5: Refer the data:J, K, L, M and N collected stamps. They collected a total of 100 stamps. None of them collected less than 10.No two among them collected the same number.(i) 3 collected the same number as K and M together.(ii) L collected 3 more than the cube of an integer(iii) The no. Collected by J was the square of an integer.(iv) Total no. Collected by K was either the square or cube of an integer.1. The no. Collected by J was:(1) 27 (2) 49 (3) 36 (4) 642. How many 9 digit nos can be formed using 1,2,3,4,5 ,; divisible by 4?