self Maths Puzzle

There is 7 friends (A1, A2, A3....A7).If A1 have to have shake with all without repeat. How many handshakes possible?
a) 6 b) 21 c) 28 d) 7

Read Solution (Total 4)

Ans:6
Because only A1 have to hand shake,so A1 can hand shake with remaining 6 person.
If the question is find the total no of hand shake with each other. Then the answer will be 7c2=21.
12 years agoHelpfull: Yes(60) No(16)

7C2=21
no. of ppl C 2 will give no of hndshakes
13 years agoHelpfull: Yes(6) No(62)
A1 will shake hands with A2,3,4,5,6(total=6)
Answer will be 6
7 years agoHelpfull: Yes(0) No(0)
A1 gives handshake rest of the friends ...and he himself cant handshake so N-1 = 7-1=6
6 years agoHelpfull: Yes(0) No(0)

self Other Question

A car manufacturer produces only red and blue models which come out of the final testing area at random. What is the probability that five consecutive cars of same color will come through the test area at any one time?
a) 1 in 16 b) 1 in 125 c) 1 in 32 d) 1 in 25 If there are 2 wheelers and 4 wheelers parked in a school located at the heart of the city, find the number of 4 wheelers parked there if there were 20 two wheelers parked there
a)48 b)50 c)52 d)64