CADENCE Company

Q. There were 105 handshakes. how many persons were there in party.

Read Solution (Total 3)

Total 15 persons in the party.

n(n-1)/2 = 105
n^2 - n/2 = 105
n^2 - n = 210
By solving for n, we put n=15.
So, total persons = 15
12 years agoHelpfull: Yes(3) No(1)

let n be the total no. of person then
nc2=105
n(n-1)/2=105
n=15
7 years agoHelpfull: Yes(2) No(0)
n(n-1)/2=105
n^2-n=210
n^2-n-210=0
n=15
5 years agoHelpfull: Yes(0) No(0)

CADENCE Other Question

Q. 2/3 of crockery (plates) are broken, 1/2 have some other thing (handle) broken, 1/4 are both broken and handle broken. Ultimately only 2 pieces of crockery were without any defect. How many crockery were there in total. Q. There were 6 boys and 6 girls. how many ways they can be arranged in a pair.