student is instructed to answer 8 out of 12 questions.
i. How many differnet ways can he choose the questions?
ii. How many different ways can he choose the questions so that question number 1 will be included?
iii. How many different ways can he choose the questions so that question number 1 will be included and question number 10 will be excluded?..
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Answer:
i. 12C8=12x11x10x9x8/4x3x2x8=11x5x9=495 different ways.
ii. 330
iii.120
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