Permutations and Combinations

Permutations and Combinations

Question

The income of a person is Rs. 3,00,000 in first year and he receives an increase of Rs. 10,000 to his income per year for next 19 years. Find the total amount, he received in 20 years. 

Answer

Here,     a = 3,00,000,  d = 10,000, n = 20

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#6 {main}</pre> open curly brackets By space using space straight S subscript straight n space equals space straight n over 2 left parenthesis 2 straight a plus left parenthesis straight n minus 1 right parenthesis straight d close curly brackets
                                     = 10 (7,90,000) = 79,00,000.

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