Re: How many natural numbers less than 10^8 are there, whose sum of digits equals 7?
My focus is DSE and ISI as my English is very very weak. Will you please suggest which book (and topics) to follow for DSE/ISI masters econ (Apart from Chiang, Sydsaeter-Hammond and Simon-Blume)? Is the combo of Sydsaeter-Hammond and Simon-Blume enough for DSE/ISI or any further reference needed?
(I have bachelors in commerce and have working knowledge of maths upto 10+2 NCERT level.)