Numbers Aptitude Test Paper 26) Which of the following numbers is divisible by 9?
The Correct answer is (D) Answer with explanation: A number is divisible by 9 if the sum of its digits is divisible by 9. Sum of the digits of the given numbers are; 6+7+5+7+8= 33 5+6+7+8+5= 31 4+5+6+7+8= 30 6+5+8+8+9= 36 The sum of the digits of the number 65889 is 36 which is divisible by 9, so the correct answer is 65889. 7) If (2^{p} + 1) is a prime number, which one of the following digits could be the value of p?
The Correct answer is (B) Answer with explanation: In such questions, each alternative should be tried. So, if P = 3, we will get; 8 + 1= 9 If P = 4, we will get; 16 + 1 = 17 If P = 5, we will get; 32 + 1 = 33 If P= 6, we will get; 64 + 1= 65 Out of the four results, only 17 is the prime number. So, the required value of the P is 4. 8) Find the number of threedigit numbers which are divisible by 6.
The Correct answer is (A) Answer with explanation: The required three digit numbers would be 102, 108, 114, 120...990 and 996. The sequence of numbers shows that it is an arithmetic progression, where 'a' = 102, 'd' = 6 and last number = 996 Let the number of terms = n 9) What is the sum of first 35 natural numbers?
The Correct answer is (B) Answer with explanation: First 35 natural numbers are 1, 2, 3, 4, 5.....35 10) Given that 1+2+3+.. +9 = 45, find the value of (11+12+13+..+19).
The Correct answer is (C) Answer with explanation: 11+12+13+...+19 is an arithmetic progression with number of terms 'n' = 9, first term = 11 and last term = 19. Apply formula; Sn = n/2 (first term + last term) ∴Required value or sum = 9/2 ( 11 + 19) = 4.5 * 30 = 135
Numbers Aptitude Test Paper
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