# Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2020 | Feb-Mar | (P1-9709/12) | Q#7

Question The diagram shows a sector AOB which is part of a circle with centre O and radius 6  cm and with angle AOB = 0.8 radians. The point C on OB is such that AC is  perpendicular to OB. The arc CD is part of a circle with centre O, where D lies on  […]

# Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2020 | Feb-Mar | (P1-9709/12) | Q#6

Question The coefficient of  in the expansion of  is 720. a)Find the possible values of the constant . b) Hence find the coefficient of  in the expansion. Solution a) We are given expression as; Expression for the general term in the Binomial expansion of is: In the given case: Hence; Since we are looking for […]