Hello,
No,there's no problem at pursuing dual degree.
A dual degree is a combination of bachelor's and masters degree which you get to pursue in 5 years.
If you pursue these two separately then it takes 6 years. So dual degree saves your one year and more over it will allow you to experiment with things you are interested in.
In terms of placement you don't lag any where in comparison to B.tech students.
Same opportunities are given to dual degree student like B.tech students.
It depends on the student what they want to prefer.
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