RRB Non Technical Model Papers 9 with solutions

Question : 66 of 100

Marks: +1, -0

Three of the following four are alike in a certain way and so form a group. Which is the one that does not belong to that group ?

Solution:

(1) In the given numbers, 3 are equal among 4. So, 4 are equal among all 7.
∴ No. of unequal groups

=^ 7C_4

={7!}/{4!3!}

={7× 6× 5 ×4!}/{4 !×3 ×2}= 35

So, 35 are not related

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