1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.
An Intiative by Sri Chaitanya
a
20
b
16
c
18
d
15
answer is C.
(Unlock A.I Detailed Solution for FREE)
Best Courses for You
JEE
NEET
Foundation JEE
Foundation NEET
CBSE
Detailed Solution
We have, 7103−7(49)51−7(50−1)51 =7(5051−51C15050+51C25049−…−1) =7(5051−51C15050+51C25049−…)−7+18−18 −7(5051−51C15050+51C25049−…)−25+18 =k+18(say) Q kis divisible by25,∴ remainder is 18.