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20 നും 100 നും ഇടയിലുള്ള മുഴുവൻ ഒറ്റ സംഖ്യകളുടെയും തുക?

A2000

B2400

C2500

D2300

Answer:

B. 2400

Read Explanation:

21,23,.........99 ഒറ്റ സംഖ്യകളുടെ എണ്ണം = (99-21/2)+1 = 39+1 = 40 ഒറ്റ സംഖ്യകളുടെ തുക = 40/2(21+99) = 2400


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