For the integer n, if n*n*n is odd, then what is true
n is odd and n*n is even
n*n is odd
n is even
n*n is odd
Answer: Option A
Similar Questions :
1. 587 * 999 = ?
586411
586413
486411
486413
Answer: Option B
Explanation:
Trick: 587 * (1000 - 1) = 587000 - 587 = 586413
2. A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as remainder. The number is
22030
220030
23030
24030
Answer: Option B
Explanation:
(555 + 445) * 2 * 110 + 30 = 220000 + 30 = 220030
3. 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
4. Which is smallest prime number
0
2
3
7
Answer: Option B
5. 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}