(a) Let the integers 1 to 23 be written on a straight line. Can you insert “+” and “−“ signs between them so their sum is zero. Explain! (b) How many numbers less than 700 are divisible by 4 or 11? Explain!

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Q: of that Аня And then Lim An- UA An ind then Lim An = An 4 nzl

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Q: Let ?={1,2,3,4,5,6}. How many subsets of ?A contain an even number of elements? (How would you…

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