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If LCM of a and 18 is 36 and HCF of a and 18 is 2 then value of a will be: (a) 1

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If LCM of a and 18 is 36 and HCF of a and 18 is 2 then value of a will be:

(a) 1

(b) 2

(c) 5

(d) 4

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Answer is (d) 4

Since two numbers  are and 18

H.C.F. = 2

L.C.M. = 36

Product of both = H.C.F. x L.C.M.

a x 18 = 2 x 36

a = 4

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