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An electronics store receives a shipment of 20 graphing calculators, 8 that are defective. Four of the calculators are select

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The numbere of group of element from n umber of element is ne ni that can be formed nen. where ne = 1 (non)! . A) Here we havNod, 2004 - २०॥ 11 (२०-4) 20. 4. 16! २० x 19x 18 x 14 x 16 ! 4!x 16 !20x19x 18 x 17 4 X 3X2 x 1 = 4845 .: 2004 = 4845 Answer A 9845) selections can be made.By Out of 20 calculations, if 8 are defective, then the number of no defective calculator is (20-8 ie 12 so, in this case we121 So, the required number is- 112 ea) Now, 12 C4 - 4? (2-)! 121 41 81 12x11x 16x9x8! 41x81 12x11 X 10 X 4x 3X2X1 = 495 .: 1

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