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P Pankaj Sanodiya
(a) prime number (b) Composite number (c) Prime number, Composite number (d) 2 (e) 4 (f) 2

P Pankaj Sanodiya
Five pairs of prime numbers less than 20 whose sum is divisible by 5 are : 2+3=5 2+13=15 3+17=20 7+13=20 19+11=30

P Pankaj Sanodiya
(a) 21 = 3 + 7 + 11 (b) 31 = 5 + 7 + 19 (c) 53 = 3 + 19 + 31 (d) 61 = 11 + 19 + 31

P Pankaj Sanodiya
Seven consecutive composite numbers less than 100 so that there is no prime number between them are : Between 89 and 97, both of which are prime numbers, there are 7 composite numbers. They are: 90,91,92,93,94,95,96

P Pankaj Sanodiya
(a) 23,23=1 23,23=23 123,23=1 23,23=23 1 23 has only two factors, 1 and 23. Therefore, it is a prime number. (b) 51,51=1 51,51=3 1751,51=1 51,51=3 17 51 has four factors, 1, 3, 17, 51. Therefore, it is not a prime number. It is a composite number. (c) 37 It has only two factors, 1 and 37. Therefore, it is a prime number. (d) 26 26 has four factors (1, 2, 13, 26). Therefore, it is not a...

P Pankaj Sanodiya
three pairs of prime numbers whose difference is 2 are : 3,5 41,43 and 71,73

P Pankaj Sanodiya
(a) 44 = 37 +7 (b) 36 = 31 +5 (c) 24 = 19 +5 (d) 18 = 11 +7

P Pankaj Sanodiya
Prime numbers between 1 and 10 are 2, 3, 5, and 7. Among these numbers, 7 is the greatest.

P Pankaj Sanodiya
Prime numbers less than 20 are : 2, 3, 5, 7, 11, 13, 17, 19 Composite numbers less than 20 are : 4, 6, 8, 9, 10, 12, 14, 15, 16, 18

P Pankaj Sanodiya
Prime Number having the same digit are: 17,71 37,73 and  79,97