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চলুন (1+x+2x^2)^20=a0+a1x+a2x^2+।...a40x...

চলুন (1+x+2x^2)^20=a_0+a_1x+a_2x^2+।...a_40x^40। তারপর, a_1+a_3+a_5... ... a_37 এর সমান : | সিএল...

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