∑ { 2r } =? {1-r 2 +r 4 } Note: the sigma Sign is both for numerator and Denominator.

Question

∑ { 2r } =? {1-r 2 +r 4 } Note: the sigma Sign is both for numerator and Denominator.

Abhishek Singh · Answer

hey its easy factorise the denominator as ( r 2 -r+1)(r 2 +r+1). now see the diff. of these terms is 2r so you can split the summation.and solve it

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∑ { 2r } =? {1-r 2 +r 4 } Note: the sigma Sign is both for numerator and Denominator.

∑ { 2r } =?
{1-r²+r⁴}
Note: the sigma Sign is both for numerator and Denominator.

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∑ { 2r } =? {1-r 2 +r 4 } Note: the sigma Sign is both for numerator and Denominator.

∑ { 2r } =? {1-r2+r4}Note: the sigma Sign is both for numerator and Denominator.

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∑ { 2r } =?
{1-r²+r⁴}
Note: the sigma Sign is both for numerator and Denominator.