Numbers Aptitude Test Paper 416) Which of the following is the output of 495 * 495  105 * 105?
The Correct answer is (A) Answer with explanation: Apply formula; (a^{2}  b^{2}) = (a  b) (a+b) 495 x 495  105 x 105 = (495^{2}  105^{2}) = (495  105) (495 + 105) = 390 * 600 = 234000 17) What is the unit digit in the product of 853 * 1346 * 452 * 226?
The Correct answer is (C) Answer with explanation: Pick up the unit digit of each number and multiply them; 3 in 853 6 in 1346 2 in 452 6 in 226 ∴3 * 6 * 2 * 6 = 216 (consider the unit digit in the product) So, the unit digit in the product of 853 * 1346 * 452 * 226 is 6. 18) If twothird of threefourth of a number is 34, find the 20% of that number?
The Correct answer is (B) Answer with explanation: Let the number is X. As per question; 19) What is the sum of all odd numbers up to 240?
The Correct answer is (A) Answer with explanation: Number of odd numbers up to 240 =^{240}⁄_{2}= 120 Sum of first n odd numbers = n^{2} n = 120 Required sum = 120^{2 }= 14400 20) What are the different prime factors of 2400?
The Correct answer is (B) Answer with explanation: L.C.M of 2400 = 2 x 2 x 2 x 2 x 2 x 3 x 5 x 5 The different prime factors are 3 (2, 3 and 5).
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