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51 കുട്ടികളുള്ള ഒരു ക്‌ളാസിലേ 21-ാം റാങ്കുകാരനാണ് രവി എങ്കിൽ പിന്നിൽ നിന്നും രവി എത്രാമതാണ് ?

A30

B22

C31

D29

Answer:

C. 31

Read Explanation:

ആകെ = m+n-1

51=21+n-1

52=21+n

n=52-21=31

ഒരു വ്യക്തി / ഒരു വസ്തു, ഒരു വശത്തു നിന്നും nth ഉം മറുവശത്തു നിന്നും mth ഉം ആയി Rank നൽകിയാൽ ആ വരിയിൽ നിരയിൽ ആകെ (m+n-1) വ്യക്തികൾ/ വസ്തുക്കൾ ഉണ്ടായിരിക്കും


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