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Six children take part in a tournament. Each one has to play every other one. How many games must they play?

A10

B15

C12

D18

Answer:

B. 15

Read Explanation:

n(n-1)/2 = 6(6-1)/2 = (6x5)/2 = 15


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Out of 100 students 40 passed in Physics and 30 passed in Chemistry. If 18 passed in both the subject, then what is the number of students failed in both subject?
ഏതൊരു രണ്ടക്കസംഖ്യയിൽ നിന്നും ആ സംഖ്യയുടെ അക്കങ്ങളുടെ തുക കുറച്ചാൽ കിട്ടുന്ന സംഖ്യ?