Q 14 17 18 20 22

Q 14 17 18 20 22 •IS. - • (A1-12 . 11 16

Dear student
20
Let the series of an AP a1,a2,a3,a4,a5 bea-2d,a-d,a,a+d,a+2dGiven: a1+a3+a5=-12a-2d+a+a+2d=-123a=-12a=-4Also givena1a2a3=8a-2da-da=8Substituting the value of a and solving for d we get 2 possible values for die d=-3 or d=-5Now, for d=-3 and a=-4a2=a-d=-4+3=-1a4=a+d=-4-3=-7a5=a+3d=-4-9=-13Sum =-1-7-13=-21When d=-5 and a=-4a2=a-d=-4+5=1a4=a+d=-4-3=-7a5=a+3d=-4-15=-19Sum =1-9-19=-27
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