question for extra credit.
I'll up vote immediately tnx in advance
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(b) [Refer to diagram) Musa is at a library and he wants to visit his friend Halim's house which is located 10 blocks west and 8 blocks south of the library. All streets from the library to Halim's house are laid out in a rectangular grid, and all of them are available for walking except for the streets indicated by X00%. If he walks exactly 18 blocks from the library to Halim's house, how many different paths are possible for Musa, given the constraint that he has? (There is no need for you to include the rectangular grid in your answer just provide combinatorial computations.) Library **XX Halim's House [ 5 marks
(c) By using the binomial theorem, obtain the full expansion of (2x - 5y)" with the coefficients written as integers. [3 marks]