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Question Detail
Simplify (212 * 212 + 312 * 312 )
- 132288
- 142088
- 142188
- 142288
Answer: Option D
Explanation:
Trick: Above equation can be solved by using following formula
\begin{aligned}
(a^2 + b^2) = \frac{1}{2}((a+b)^2 + (a-b)^2)
\end{aligned}
1. 469157 * 9999
- 1691100843
- 4591100843
- 4691100843
- 3691100843
Answer: Option C
Explanation:
469157 * (10000 - 1)
= 4691570000 - 469157
= 4691100843
2. 587 * 999 = ?
- 586411
- 586413
- 486411
- 486413
Answer: Option B
Explanation:
Trick: 587 * (1000 - 1) = 587000 - 587 = 586413
3. What least number should be added to 1056, so that the sum is completely divisible by 23
- 4
- 1
- 2
- 3
Answer: Option C
Explanation:
(1056 / 23) gives remainder 21
21 + 2 = 23, So we need to add 2
4. Simplify 586645 * 9999
- 5865863355
- 5665863355
- 4865863355
- 4665863355
Answer: Option A
Explanation:
Although it is a simple question, but the trick is to save time in solving this.
Rather than multiplying it we can do as follows:
586645 * (10000 - 1) = 5866450000 - 586645 = 5865863355
5. 7589 - X = 3434
- 4155
- 2321
- 3155
- None of above
Answer: Option A
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