Persistent Systems System Engineer interview questions

Interview was tough they ask first to write programs to accpet a string and count and pattern printing and nhi pta nhi pta nhi pta nhi pta nhi pta nhi pta nhi pta nhi pta

At first a coding question of Pascal triangle was asked. But I couldn't answer that, so they rejected me at that moment. So, prepare well . And know all the basic knowledge about programming language, dsa, networking, os and all.