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ഒരു ക്ലാസ്സിലെ 10 കുട്ടികൾ പരസ്പരം ഹസ്തദാനം നൽകിയാൽ ആകെ എത്ര ഹസ്തദാനം നടക്കും ?

A30

B22

C40

D45

Answer:

D. 45

Read Explanation:

ആകെ ഹസ്തദാനം = n(n - 1)/2 = 10(10 - 1)/2 = 45


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