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Let D(70) = {1,2,5,7,10,14,35,70}. Def...

Let ` D_(70) = {1,2,5,7,10,14,35,70}.` Define '+' , ',' and ',' by a+b =lcm (a,b),a.b=gcd (a,b) and a' `= (70)/(a)` for all a, b ` in D_(70) `. The value of ` (2+7) (14.10)'` is :
a)7 b)14 c)35 d)5

A

7

B

14

C

35

D

5

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The correct Answer is:
A
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