PSC and other competitive exams always contains questions with shake hands. Lets see how can we solve the questions with shake hands<\/p>\n
Total Number of shake hands exchanged if n people shake hands each other = (n2<\/sup>-n)\/2 = (n(n-1))\/2<\/p><\/blockquote>\n
Q1: How many shake hands were exchanged in a meeting with 20 people?<\/p>\n
(n2<\/sup>-n)\/2
\n=(202<\/sup>-20)\/2
\n=(400-20)\/2
\n=190<\/p>\nType 2: Find Number of people if Shake hands is given<\/h2>\n
Number of people \u00a0= The Biggest among the consecutive factor of double the number of Shake hands<\/p><\/blockquote>\n
Q2: In a meeting 45 shake hands were exchanged. Then how many people attended the meeting?<\/p>\n
Total number of shake hands exchanged = 45
\nMultiply the total number of shake hands by 2 i.e.\u00a045 x 2 = 90
\nConsecutive factors of 90 = 10 and 9 (10 x 9 = 90)
\nBigger among them is 10
\nSo the answer is 10<\/p>\nQ3: In a meeting 36 hand shakes were exchanged. Then how many people attended the meeting?<\/p>\n
Total number of shake hands exchanged =\u00a036
\nMultiply the total number of shake hands by 2 i.e.\u00a0\u00a036\u00a0x 2 =\u00a072
\nConsecutive factors of 90 = 8\u00a0and 9 (i.e.\u00a08 x 9 = 72)
\nBigger among them is\u00a09
\nSo the answer is\u00a09<\/p>\n","protected":false},"excerpt":{"rendered":"PSC and other competitive exams always contains questions with shake hands. Lets see how can we solve the questions with shake hands Type 1: Find Shake hands if number of people is given Total Number of shake hands exchanged if n people shake hands each other = (n2-n)\/2 = (n(n-1))\/2 Q1: How many shake hands […]<\/p>\n","protected":false},"author":1,"featured_media":53,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[2],"tags":[],"class_list":["post-51","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-maths"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/img.examcoaching.in\/number-of-shake-hands.jpg?fit=1200%2C630&ssl=1","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p7pDEj-P","jetpack-related-posts":[{"id":47,"url":"https:\/\/www.examcoaching.in\/blog\/47\/sum-of-numbers","url_meta":{"origin":51,"position":0},"title":"Sum of Numbers","author":"Ranjith","date":"August 5, 2016","format":false,"excerpt":"Sum of First n odd Numbers Sum of First n odd Numbers \u00a0= N2 Where N\u00a0= (max no + 1)\/2 Q1: What is the sum of first 5 odd numbers? 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