1. 252 can be expressed as a product of primes as :
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2. Which of the following has most number of divisors ?
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3. A number n is said to be perfect if the sum of all its divisors (excluding n itself) is equal to n An example of perfect number is :
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4. HCF of 4 x 27 x 3125, 8 x 9 x 25 x 7 & 16 x 81 x 5 x 11 x 49 is :
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5. Find the highest common factor of 36 and 84
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6. The H.C.F of 204, 1190 and 1445 is :
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7. Which of the following is a pair of co-primes ?
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