(1) The probability of selecting a red marble from the bowl is 1 out of 5.

Total number of marbles = 10

Prob of selecting red marbles, P(Red) = 1/5

Therefore , number of red marbles = 2

We have no information of number of green marbles

Not sufficient

(2) The probability of selecting a blue marble is twice that of selecting a red marble.

P(Blue) = 2 * P(Red)

But since we have no information on actual number of either , we can't determine number of green marbles.

If number of blue =2 and red = 1 , green = 7

if number of blue =4 and red = 2 , green = 4

if number of blue =6 and red = 3 , green = 1

Not sufficient

Combining 1 and 2 , we get

Number (Red )=2

Number (Blue) = 4 and number (Green )= 4

Answer C

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