The numbers 13 and 31 are prime numbers. Both these numbers have same digits 1 and 3.Find such pairs of prime numbers up to 100.
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In track meets both 100 yards and 100 metres are used as distances; By how many metres is 100 metres longer than 100 yards?
We need to divide by 100 here just to convert cm to meter. 1 cm = 1/100 m Hope you understand
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How many numbers are there in all from 6000 to 6999 (Both 6000 and 6999 included) having all digits same?
(c) Total numbers between 6000 to 6999 = 1000. Now, when all the digits are different, then thousands place is always to be filled by 6, next place by any...
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Give three pairs of prime numbers whose difference is 2. [Remark: Two prime numbers whose difference is 2 are called twin primes.]
3 and 5; 5 and 7; 11 and 13
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By reversing the order of digits of the greatest number made by five different non-zero digits, the new number is the _____ number of five digits.
By reversing the order of digits of the greatest number made by five different non-zero digits, the new number is the smallest number of five digits
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A mobile number consists of ten digits. The first four digits of the number are 9, 9, 8 and 7. The last three digits are 3, 5 and 5.
These digits are 6, 4, 2.
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In a certain city, all telephone numbers have six digits, the first two digits always being 41 or 42 or 46 or 62 or 64.
If first two digit is 41, the remaining 4 digits can be arranged in 8P4 = 8 x 7 x 6 × 5 = 1680 ways. Similarly, if first two digit...
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A number consisting of two digits is seven times the sum of its digits. When 27 is subtracted from the number, the digits are reversed.
Let the tens and the units digits of the required number be x and y, respectively. Required number = (10x + y) 10x + y = 7(x + y) 10x + 7y =...
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A two-digit number is such that the product of its digits is 35. If 18 is added to the number, the digits interchange their places.
Let the tens and the units digits of the required number be x and y, respectively. Then, we have: xy = 35 …….(i) Required number = (10x + y) Number obtained on reversing its...
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A two-digit number is such that the product of its digits is 18. When 63 is subtracted from the number, the digits interchange their places.
Let the tens and the units digits of the required number be x and y, respectively. Then, we have: xy = 18 …….(i) Required number = (10x + y) Number obtained on reversing its...
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