Subject :IMO Class : Class 6

State 'T' for true and 'F' for false and select the correct option.

(i) A prime number cannot have 0, 2, 4, 5, 6 and 8 at its ones place except 2.

(ii) Two numbers are called co-primes, if their L.C.M. is 1.

(iii) If X is a factor of Y and Y is a factor of Z, then X is also a factor of Z.

(iv) 4 is the smallest composite number.

A

B

C

D

I think correct answer is B. Because all the numbers having 2 at ones are not prime number

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Class : Class 6

but 5 is primeso 1 is false

## Ans 3:

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Class : Class 7

To be more specific, the statement should have been: -A prime number cannot have 0,2,4,5,6 and 8 at its ones place except for 2 and 5.

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Class : Class 4

5 is prime so ( i ) is false but they have given that (i)is true why do they confuse us so much

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## Ans 7:

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Class : Class 7

5 is a prime number which makes the correct option as B

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## Ans 9:

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Class : Class 6

but 5 is prime so ( i ) is false but they have given that (i)is true

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## Ans 11:

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Class : Class 6

ans. is wrong ,ans. is B

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## Ans 13:

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Class : Class 8

Its not possible to have a number divisible by 2 in case of the digit at ones place being 5. So, (i) is false.(ii)F(iii)T(iv)TSo, B should be the answer. But the answer says C. Have no ideas why.

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## Ans 15:

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Class : Class 6

5 itself is a prime number, so option i) cannot be true.The correct answer should be B.

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Class : Class 6

B is correct as 5 is a prime number in units place. Pls correct this Admin.