Question
A box contains 13 black and 13 white balls. The
probability of drawing two balls of the same colour is? ÂSolution
Total number of balls = 13 + 13 = 26 Let S be the sample space. Then, n(S) = number of ways of drawing 2 balls out of 26Â =Â 26C 2Â =Â `(26xx25)/(2xx1)=325` Let E = event of drawing 2 balls of the same color n (E)Â =Â 13C 2Â +Â 13C2Â =Â `(13xx12)/(2xx1)+(13xx12)/(2xx1)` Â Â = 78 +78 = 156 Â P (E)Â =Â `(n(E))/(n(S))=156/325`
92, 88, 79, 63, 40
Find the wrong number in the given number series.
9, 10, 65, 27, 217, 50- 2024, 1583, 1193, 822, 498, 209
99Â 124Â Â 160Â Â 209Â Â 273Â Â 355Â Â 454
Find the wrong number in the given number series.
78, 103, 152, 233, 356, 523Find the wrong number in given series.
1148, 1178, 1516, 1597, 2928, 3097
A-5,  A,  35,  52, 78, 115
Find the wrong number in the given number series.
243, 324, 432, 576, 746, 1024
120, 60, 80, 90, 180, 450
3, 15, 35, 63, 99, 143
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