Hard Math Class 12 Level 7

On A={0,1,...,39}, relation R is defined by aRb when a-b is divisible by 10. What is the number of equivalence classes of R?

A={0,1,...,39} पर relation R दिया है: aRb जब a-b 10 से विभाज्य हो। R की equivalence classes की संख्या क्या होगी?

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Correct Answer

B. 10

Explanation

Step 1: identify the concept as equivalence relation modulo 10. Step 2: numbers are grouped by remainders 0 to 9, so there are 10 classes. Step 3: exam tip: in modulo n relation, classes equal the possible remainders.

Step 1: concept equivalence relation modulo 10 है। Step 2: numbers को remainder 0 से 9 तक group किया जाता है इसलिए कुल 10 classes मिलती हैं। Step 3: exam tip: divisibility modulo n में classes की संख्या possible remainders के बराबर होती है।

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