A number is written as a product of its prime factors. The factors are all primes less than 10. If none of the prime factors are repeated, what is the number ?

210

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105

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1890

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945

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Solution

The correct option is A 210
All the primes less than 10 are 2,3,5 & 7
$∴$ The number with non repeated primes less than 10= $2 \times 3 \times 5 \times 7$ = 210

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A number is written as a product of its prime factors. The factors are all primes less than 10. If none of the prime factors are repeated, what is the number ?

The correct option is A 210All the primes less than 10 are 2,3,5 & 7 ∴ The number with non repeated primes less than 10= 2×3×5×7= 210

The correct option is A 210
All the primes less than 10 are 2,3,5 & 7
$∴$ The number with non repeated primes less than 10= $2 \times 3 \times 5 \times 7$ = 210