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How many numbers less than 60 are prime numbers?

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Important Questions on Numbers

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What is the sum of all prime numbers lying between 50 and 90?
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What least value must be given to A so that the number 7653A1 is completely divisible by 9?
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What least value must be given to A so that the number 84765A2 is divisible by 8?
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What least value must be given to * so that the number 751 *432 is divisible by 3?
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What least value must be given to ** so that the number 78*3945 is divisible by 11?
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Which of the following numbers is not exactly divisible by 18?
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Which of the following number is exactly divisible by 99?
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In a division sum, the divisor is 10 times the quotient and 5 times the remainder. If the remainder is 46, the dividend is: