Question Detail

For the integer n, if nnn 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

1. 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

2. 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}

3. 587 * 999 = ?

586411
586413
486411
486413

Answer: Option B

Explanation:

Trick: 587 * (1000 - 1) = 587000 - 587 = 586413

4. For the integer n, if nnn 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

5. 1939392 * 625

1212120010
1212120000
1212120011
1212121010

Answer: Option B

Explanation:

Trick: when multiplying with \begin{aligned} 5^n
\end{aligned} then put n zeros to the right of multiplicand and divide the number with \begin{aligned} 2^n
\end{aligned}
So using this we can solve this question in much less
time.
\begin{aligned} 1939392 \times 5^4 = \frac {19393920000}{16} = 1212120000
\end{aligned}

Tanima Guha 10 years ago

ans is not correct.ex:3 is odd,3*3=9 is odd,3*3*3=27 is odd
harshada 10 years ago

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 reg this ques.take a s example 5 ie.5*5*5 so ans either will be B or D.
1729 10 years ago

option D is right
KRISHNENDU 11 years ago

TOTALLY WRONG ANSWER ..ANSWER IS B OR D
ashish 12 years ago

wat if integer is 7 ans is b
GCC 12 years ago

Answer is B and D.
Lets say n is 3 odd no.
n*n=3*3=9 which is odd
n*n*n=3*3*3=27 which is also odd