in a party every person shakes hands with every other person. if there were a total of 190 handshakes in the party then what is the number of persons present in the party?
Answers.
A) 15	B) 16	C) 17	D) 18	E) 20
<gadget id="calculator">190 * 2</gadget>
<output>380</output>

<gadget id="calculator">380 * 4</gadget>
<output>1_520</output>

<gadget id="calculator">1_520 + 1</gadget>
<output>1_521</output>

<gadget id="calculator">1_521 ** (1/2)</gadget>
<output>39</output>

<gadget id="calculator">39 + 1</gadget>
<output>40</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>E</result>
in a party every person shakes hands with every other person. if there were a total of 190 handshakes in the party then what is the number of persons present in the party?
divide(add(sqrt(add(multiply(multiply(190, const_2), const_4), const_1)), const_1), const_2)
"explanation : let the number of persons be n â ˆ ´ total handshakes = nc 2 = 190 n ( n - 1 ) / 2 = 190 â ˆ ´ n = 20 answer : option e"