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Practise Set - 10 (in Hindi)
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Important Questions

Nitish Kumar
Plus Educator || Star and Verified Educator || 1.5 year old on Unacademy😊 || IITJEE and Olympiad Specialist ||

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U
Unacademy user
sir if you can please post DNA before 6 pm.And sir please give more example for english dna as you are doing for hindi.thank you sir
Sir, i got the answer using an alternative method. while multipying (1-5x)^-1 * (1-4x)^-1 , coefficient of x^n comes to be 5^n + 4.5^(n-1) + 4^2.5^(n-2)+....4^n, which can be evaluated using formula of (a^n-b^n)/(a-b)=a^(n-1) + b.a^(n-2)+....b^(n-1)