Three biased coins were tossed 800 times simultaneously. The outcom...

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Three biased coins were tossed 800 times simultaneously. The outcomes are given in the table below partially.

Outcome No head One head Two heads
Frequency \( \quad 120 \quad 280 \quad x \)
If the occurrence of two heads was thrice that of all heads. Find \( x \).
(a) 150
(b) 240
(c) 300
(d) 360
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