bank Exam Numerical Ability Permutation and Combination

three numbers are picked randomly from a set of first 100 natural numbers . what is the probability that at least 2 numbers will be prime no

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the difference between simple interest and compound interest for 2nd year and 3rd year is Rs 100 and Rs 205 respectively . then what is the sum? 64*32 =32, 55*42=41, 64*46 = 33, 26*36=?
a)23, b)13 c) 33 d) 31