In such problems drz alwys sm kinda pattern.
here all d terms are of 3 digits and acc to div rule of 11 jst subtract the triplets adjacent to each odr and d diff will gv d remainder.
In dis q a1=101, b1=150, b1-a1=49, rem=5
a2=104, b2=151, b2-a2=47, rem=3
a3=107, b3=152, b3-a3=45, re...