Mike's Sports Number

Since only 1 option is correct, it can only be either odd or even so C and D are eliminated, and a number which is not prime and composite between 1 and 20 is 1. So mike number is 1.

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Chris's Birthday

If today is January 1st, and December 31st was Chris' birthday and she turned 8, and on December 30 Chris was 7, and this year Chris will turn 9, then next year Chris is turning 10.

What are we?

The number 1, 2, 3, 4, 5, 6, 7, 8, 9, and 0 on a US keyboard when you hold the shift button down.

Ans : 16 Name the 10 people with letters: A, B, C, ... and so on. A through F each call any one of G, H, I, or J (it doesn't matter which one). That makes six calls so far. Then G calls H and I calls J, after which G calls I and H calls J. Now we've used 10 calls, and G, H, I, and J all know everything. Finally, each of A through F is called by someone in G through J - 6 more calls to get everyone knowing everything. 16 calls in all.

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