[" Frafferen "(3)/(9)" .HIT "(1)/(811)" and "],[" (a) "tan75^(@)+cot75^(@)]

9,3,1,(1)/(3),(1)/(9),"…."

9,3,1,(1)/(3),(1)/(9),"…."

9,3,1,(1)/(3),(1)/(9),"…."

9,3,1,(1)/(3),(1)/(9),"…."

(1)/(2.5)+(1)/(5.8)+(1)/(8.11)+.... nterms =

Four persons can hit a target correctly with probabilities (1)/(2),(1)/(3),(1)/(4) and (1)/(8) respectively. Probability that target is hit if all hit at the target at same time

Four persons can hit a target correctly with probabilities (1)/(2),(1)/(3),(1)/(4) and (1)/(8) respectively.If all hit at the target independently, then the probability that the target would be hit, is