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Given, Number of white balls = 13 Let x be the number of black balls. Total number of balls in the bag = 13 + x Also, the probability of drawing a black ball from the bag is 3 times that of drawing a white ball. ⇒ x/(13 + x) = 3[13/(13 + x)] ⇒ x = 39 Hence, the number of black balls in the bag = 39.
12, 12, 30, 120, ?, 4620
155, 161, 173, 191, ?, 245
37, 57, 82, ?, 147, 187
196, 196, 203, 229, 292, ?
178 168 148 ? 78 28
What will be come in place of (?) in the given number series.
2, 3, 5, 7, 11, ?, 17
1, 7, 37, 187, 937, ?
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
21, 28, 39, 52, ?, 88