Numbers- Aptitude Questions and Answers - in Hindi

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Evaluate 743 x 999 ?


743 x 999 का मान होगा।का मान होगा।

A)

724457


B)

784527


C)

742257


D)

74257



Correct Answer :

742257


Explanation :

743 × 999
=743 × (1000 – 1)
=743000 – 743
=742257

How many three digit numbers are divisible by 5?


5 से विभाजित होने वाली 3 अंकों की कितनी संख्याएँ हैं?

A)

200


B)

180


C)

175


D)

10



Correct Answer :

180


Explanation :

smallest 3 digit number divisible by 5 is first term, a =100
common difference ,d =5
greatest 3 digit number divisible by 5 is nth term, an =995

AP(Arithmetic Progression)
an=a+(n-1)d
995=100+(n-1)5
995=95+5n
900=5n
n=180

So , the three digits number which is divisible by 5 is 180

X is a whole number. If the only common factors of X and X2 are 1 and X, then X is _______?


X एक पूर्ण संख्या है। यदि X और X2 के गुणनखंड 1 और X हैं, तो X _______ है?

A)
1

B)
a perfect square

C)
an odd number

D)
a prime number


Correct Answer :

a prime number


Explanation :

A number that is divisible only by itself and 1 is called prime number.
so here X is a prime number.

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