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For The Mathematically Inclined

Anil Saigal
05/21/2007

FOR CHILDREN AND GROWNUPS

PROBLEM # 1
In how many ways can a student pick 7 questions from 10?

PROBLEM # 2
In an exam a student needs to answer 7 questions out of 10. The student should pick   atleast 3 from first 5 questions.  How many ways can the student pick 7 questions?

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Please send your solutions to anil@lokvani.com.

Use Problem Solutions M-053107 as the subject line. Please include your full name in the text of the main message. Everyone with the right answer will be acknowledged in the next issue of Lokvani.

Please do not post your solution in Post Comments. No credit will be given for solutions not sent to anil@lokvani.com.

If you need clarification on any problem, please contact anil@lokvani.com.

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SOLUTIONS TO PROBLEMS ON 05/17/07

FOR CHILDREN

PROBLEM # 1
Find three numbers whose mode is 8 and mean is 10. What is the median of these three numbers.

SOLUTION
8. 

FOR GROWNUPS

PROBLEM # 2
What is the last digit of the product of these exponents?
2^1988 x 3^1988 x 7^1988.

SOLUTION 
6.

Congratulations to Sandeep Bansal, Anindya Basu, Somnath Chattopadhyay, Shailesh Goregaokar, Suhas Joglekar, Dattatraya Joshi, Mukkai Krishnamoorthy and Samir Mehta, who were winners of the last set of puzzles.



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