Xavier Aptitude Test 2011 Paper

Question : 49 of 101

Marks: +1, -0

Let

a_n

1111111 .....1,

where

1

occurs

n

number of times. Then,
i.

a_741

is not a prime.
ii.

a_534

is not a prime.
iii.

a_123

is not a prime .
iv.

a_77

is not a prime.

Solution:

(d)

a_741

⇒ has 741 ones

a_534

⇒ has 534 ones

a_123

⇒ has 123 ones
741, 534 and 123 all are divisible by 3. Therefore, i, ii and iiii, are not prime.

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