GRE Exam Numerical Ability Permutation and Combination

English language has 26 alphabets, out of 4 distinct vowels and 6 distinct consonants, how many letter patterns can be made with each is to contain 4 distinct consonants and 2 distinct vowels ?

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6c4*4c2=90
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GRE Other Question

If a ≥ 25 and b ≤ 12, then which of the following must also be true ? (A) a-b ≥ 13 (B) a-b ≥ 37 (C) a-b ≤ 13 (D) a-b ≤ 35 A hose starts filling an empty tank at 6 am and can fill it completely by 10 am. But due to leakage at the bottom of the tank, 1/3 rd of the tank would still remain empty by 10 am. Now if leakage is stopped at that time, at what time will the tank be filled by this hose ? (A) 11.30 am (B) 11.20 am (C) 11.40 am (D) 11.50 am