Exercise :: Numbers - General Questions
- Numbers - Important Formulas
- Numbers - General Questions
121. | What is the unit digit in the product (365 x 659 x 771)? |
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Answer: Option C Explanation: Unit digit in 34 = 1
Unit digit in 659 = 6 Unit digit in 74 Unit digit in 771 = Unit digit in [(74)17 x 73] = (1 x 3) = 3
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122. | 3251 + 587 + 369 - ? = 3007 |
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Answer: Option D Explanation: 3251 Let 4207 - x = 3007 + 587 Then, x = 4207 - 3007 = 1200 + 369 ---- 4207 ---- |
123. | 7589 - ? = 3434 |
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Answer: Option B Explanation: Let 7589 -x = 3434 Then, x = 7589 - 3434 = 4155 |
124. | 217 x 217 + 183 x 183 = ? |
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Answer: Option B Explanation:
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125. | The unit digit in the product (784 x 618 x 917 x 463) is: |
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Answer: Option A Explanation:
Unit digit in the given product = Unit digit in (4 x 8 x 7 x 3) = (672) = 2
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126. | If the number 653 xy is divisible by 90, then (x + y) = ? |
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Answer: Option C Explanation: 90 = 10 x 9 Clearly, 653xy is divisible by 10, so y = 0 Now, 653x0 is divisible by 9. So, (6 + 5 + 3 + x + 0) = (14 + x) is divisible by 9. So, x = 4. Hence, (x + y) = (4 + 0) = 4. |
127. | 3897 x 999 = ? |
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Answer: Option B Explanation:
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128. | What is the unit digit in 7105 ? |
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Answer: Option C Explanation: Unit digit in 7105 = Unit digit in [ (74)26 x 7 ] But, unit digit in (74)26 = 1
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129. | Which of the following numbers will completely divide (461 + 462 + 463 + 464) ? |
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Answer: Option B Explanation: (461 + 462 + 463 + 464) = 461 x (1 + 4 + 42 + 43) = 461 x 85 = 460 x (4 x 85) = (460 x 340), which is divisible by 10. |
130. | 106 x 106 - 94 x 94 = ? |
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Answer: Option A Explanation:
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