Which of the following proves that 209 is NOT a prime number?
a) 209 × 1 = 209
b) 19 × 11 = 209
c) 209 is an odd number
d) 209 is not visible by 2,3,5 and 7.
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D option proves that 209 is NOT a prime number.
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Option B proves that 209 is not a prime number.
Prime numbers are those numbers which are not divisible any other number except 1 and itself.
Prime numbers are those numbers which are not divisible any other number except 1 and itself.
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