1.

IfD_(30) is the set of all divisors of 30 , x,y in D_(30), we definex+y=LCM(x,y),x*y=GCD(x,y), x'=(30)/(x) and f(x,y,z)=(x+y)*(y'+z), then f(2,5,15) is equal to

Answer»

2
5
10
15

Solution :`D_(30)={1,2,3,5,6,10,15,30}`
`F(2,5,5_=2+5)*(5'+15)`
`10*((30)/(5)+15)`
`=10(6+15)`
`10*30`
`=10`


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