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ravi1522
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I used a little bit of AP formula here-

As per question, we get x=3q+1
So, the set x has (1,4,7,....,49). We want the total number count in this set. If you notice, this looks like an AP, with common difference (d)= 3 and first term (a1) as 1.

Now, use the formula, 49= 1 + (n-1)3
=> n= 17

Ans. C.

Hope it helps.
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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