10. தொகைநிலைத் தொடர் என்றால் என்ன?

What is an inertial series?

^ I think that’s the translation

Translation: we have as many pens as they.if this question is asking whether the grammar is correct, or incorrect, then the answer should be: incorrect.  a sentence with better grammar would be: we have as many pens as them.or in spanish: tenemos tantos corrales como ellos.hope this ! : )

The correct answer here would be "a"