A supply container dropped from an aircraft by parachute hits a target with a probability of 0.37.

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A supply container dropped from an aircraft by parachute hits a target with a probability of 0.37.
(a) What is the expected number of container drops needed to hit a target?
(b) If hits from three containers are required to provide? sufficient supplies, what is the expected number of "^V containers chopped before sufficient supplies have been provided?
(c) What is the probability that sufficient supplies are provided by ten container drops?
(d) What is the probability that it is the tenth container dropped that completes the provision of supplies?
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