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AARAV GUPTA from Khaitan Public School, Ghaziabad
Subject :IMO    Class : Class 3

There were 7 children. Each child shook hands with each other. How many handshakes took place?


A28
B15
C21
D25


Ans 1:

Yatharth from DPS, VADODARA
Class : Class 4

Ans 2:

Vedant Chhabra from Blue Ridge Public School , Pune
Class : Class 5

Ans 3:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
No answer is C admin is right

Ans 4:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
You have not told that once a person has done handshake with the other people , his /her handshake will not be taken again.

Ans 5:

Vedant Chhabra from Blue Ridge Public School , Pune
Class : Class 5

Ans 6: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

The correct answer is C.

Handshakes by the first child = 6 (with remaining 6 children)

Handshakes by the second child = 5 (as the handshake with the first child is already counted)

Then, handshakes by the third child = 4 (as the handshakes with the first and second child are already counted)

Similarly, handshakes by the fourth, fifth and sixth child are 3, 2 and 1 respectively.

Since, the last child's handshakes are already counted, he/she will not make any new handshakes.

Therefore, a total of (6 +5 +4 + 3 + 2 + 1) = 21 handshakes took place.


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