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If the value of sumr=0^50(2 r+1)(-1)^r i...

If the value of `sum_r=0^50(2 r+1)(-1)^r` is a two digit number, then the sum of digits, is

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CENGAGE-SEQUENCE AND SERIES-Question Bank
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  10. If 1^3+3^3+5^3+ldots(2 k-1)^3/2^3+4^3+6^3+(2 k)^3=199/242, then the...

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  11. Let a1, a2, .., a10 be in A.P. and h1, h2, ... h10 be in H.P. If a1=h1...

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  12. The sum of the first 10 terms of the series 7/2^2 5^2+ 13/5^2 8^2+...

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  13. The value of sumn=2^oo n/1+n^2(n^2-2) is equal to

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  14. Let S=sumk=0^oo 2^k/7^2^k+1 then 1/S is equal to

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  15. If x=log 2 and y=log 3, then a+b x+c y=[log 1+log (1+3)+log (1+...

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