Q 1).Express 49 as a sum of 7 odd numbers To solve this we first see 49=7^2 So if we add 1+3+5+7+9+11+13, we get 49 Q.2)Express 121 as a sum of 11 odd numbers We see 121=11^2, So if we add first...
Question: What is the basic principle of electric pen ? Explain how it can be used for writing. Answer: Electric charge on ions is used for writing with an electric pen. Method : (i) Take a filter...