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Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers