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CBSE Class 12-science Answered

find the sum
Asked by ishita605 | 10 Oct, 2016, 11:32: PM
answered-by-expert Expert Answer
5 over 7 equals fraction numerator straight a subscript 2 over denominator 2 factorial end fraction plus fraction numerator straight a subscript 3 over denominator 3 factorial end fraction plus fraction numerator straight a subscript 4 over denominator 4 factorial end fraction plus fraction numerator straight a subscript 5 over denominator 5 factorial end fraction plus fraction numerator straight a subscript 6 over denominator 6 factorial end fraction plus fraction numerator straight a subscript 7 over denominator 7 factorial end fraction 5 over 7 equals fraction numerator left parenthesis 7 cross times 6 cross times 5 cross times 4 cross times 3 right parenthesis straight a subscript 2 plus left parenthesis 7 cross times 6 cross times 5 cross times 4 right parenthesis straight a subscript 3 plus left parenthesis 7 cross times 6 cross times 5 right parenthesis straight a subscript 4 plus left parenthesis 7 cross times 6 right parenthesis straight a subscript 5 plus left parenthesis 7 right parenthesis straight a subscript 6 plus straight a subscript 7 over denominator 7 factorial end fraction 3600 space equals left parenthesis 2520 right parenthesis straight a subscript 2 plus left parenthesis 840 right parenthesis straight a subscript 3 plus left parenthesis 210 right parenthesis straight a subscript 4 plus left parenthesis 42 right parenthesis straight a subscript 5 plus left parenthesis 7 right parenthesis straight a subscript 6 plus straight a subscript 7 Put space straight a subscript 2 space equals space 1 comma space straight a subscript 3 equals 1 comma space straight a subscript 4 space equals space 1 space comma space straight a subscript 5 space equals space 0 comma space straight a subscript 6 equals 4 comma space straight a subscript 7 space equals space 2 we space get space LHS space equals space RHS space straight a subscript 2 space plus space straight a subscript 3 plus space straight a subscript 4 space plus space straight a subscript 5 space plus space straight a subscript 6 plus space straight a subscript 7 space equals 1 plus 1 plus 1 plus 0 plus 4 plus 2 space equals space 9
Answered by Vijaykumar Wani | 12 Oct, 2016, 01:01: PM

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