Question

How many numbers from 1 to 512 are divisible for both 9 and 2.

Answer 1

Step-by-step explanation:

LCM of 9 & 2 is 18

the which is devisible by 18 is divisible by 9 & 2

so series is 18,36,54........504

a=18 d=18 tn=504 n=?

using AP formula

tn = a+(n-1)d

504=18+(n-1)18

504-18=(n-1)18

486/18= (n-1)

27= n-1

n=27+1= 28 answer

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