Question

Q: If there are 30 students in a classroom and have been given a task to do.
The Task: Give a shake hand to each other and everyone.

Your Task: Find the total number of shake hands gone in that classroom

(I DARE YOU GUYS !!!!!!!!)

Answer 1

Answer:

so the first student shake hand with 29 boys

then the second boy shake hand with 28 students

so it's continuing going but the last boy can't shake and because he already shake hand with everyone

Step-by-step explanation:

so a AP is form that is 29,28,27,26,25,.......1

so sum is 435

according to me this is the correct answer

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Answer 2

Answer:

$total \: students = 30 \\ \\ 1st \: student \: shake \: hand \: with \: 29 \\ \\ other \: \\ \\ and \: the \: second \: shake \: hand \: with \: \\ remaining \: 28 \\ \\ then \: the \: total \: handshake \: will \: be \\ \\ 29 + 28 + 27.........2 + 1 \\ \\ it \: is \\ \\ 1 + 2 + .................29 \\ \\ \\ by \: formula \: sum = \frac{n}{2}(first \: + last \: term) \\ \\ sum = \frac{29}{2} (1 + 29) \\ \\ = 15 \times 29 \\ \\ = 435 \\ \\ hence \: total \: handshake \: will \: be \: 435$