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kcscm · 20-06-08, 09:51 AM

for 4th question

let total be x students

remember ven diagrams

n(AUB)=n(A)+n(B)-n(A^B)

and n(AUB)=TOTAL-NONE PASSED

then

x-0.2x=0.72x+0.6x-518

-> 0.52x=518
then find x

correct if i am wrong.

20-06-08, 09:51 AM	#3 (permalink)
kcscm Junior Member Join Date: Jun 2008 Age: 20 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 1	Re: Apti answers required urgently for 4th question let total be x students remember ven diagrams n(AUB)=n(A)+n(B)-n(A^B) and n(AUB)=TOTAL-NONE PASSED then x-0.2x=0.72x+0.6x-518 -> 0.52x=518 then find x correct if i am wrong.