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find 1.1!+2.2!+3.3!+............nterms
find
1.1!+2.2!+3.3!+............nterms
Dear tejas S=1.1!+2.2!+3.3!+............nn! rearrange S=(2-1)1! +(3-1) 2! +(4-1) 3!+.......(n+1-1) n! =2 1! -1 1! +3 2! -1 2! + 4 3 ! -1 3!...............(n+1) n! - 1 n! =2! -1! +3! -2! +4! -3! +..............(n+1)! -n! =(n+1)! -1 Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE & AIEEE preparation. All the best. Regards, Askiitians Experts Badiuddin
Dear tejas
S=1.1!+2.2!+3.3!+............nn!
rearrange
S=(2-1)1! +(3-1) 2! +(4-1) 3!+.......(n+1-1) n!
=2 1! -1 1! +3 2! -1 2! + 4 3 ! -1 3!...............(n+1) n! - 1 n!
=2! -1! +3! -2! +4! -3! +..............(n+1)! -n!
=(n+1)! -1
Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE & AIEEE preparation. All the best. Regards, Askiitians Experts Badiuddin
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