H.C.F. of co-prime numbers 4 and 15 was found as follows: `4=2\ *\ 2\ a n d\ 15=3\ *\ 5` Since there is no common prime factor. So, H.C.F. of 4 and 15 is 0. Is the answer correct? If not, what is the correct H.C.F.?

1)what is the HCF of 2 consecutive numbers (i)numbers (ii)even nos (iii)odd nos2)HCF of co-prime numbers 4 and 15 was found as follows by factorisation :   and  since there is no common prime factor, so HCF of 4 and 15 is 0. Is the answer correct? If not, what is the correct HCF?

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Find the total number of integer n such that 2lt=nlt=2000 and H.C.F. of n and 36 is 1.

Find the total number of integer n such that 2lt=nlt=2000 and H.C.F. of n and 36 is 1.

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