Exercise
Q.1) Which of the following numbers are prime number.
a) 25
b) 23
c) 49
d) 53
e) 131
f) 83
g) 19
h) 127
i) 133
j) 121

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Q .2) Which of the following pair of numbers are co-prime numbers.

a) 25 ,23
b) 49 ,23
c) 25 ,49
d) 64, 24
e) 121 ,22
f) 16 ,35
g) 49 ,133
h) 32,39
i) 49 ,51
j) 36 ,39

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Q .3) Which of the following pair of numbers are twin prime numbers.

a) (9,11 )
b) (11,13)
c) (13,15)
d) (15,17)
e) (17,19)
f) (19,21)
g) (21,23)
h) (31,33)
i) (41,43)
j) (19,23)

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