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Quantitative Reasoning – Practice – Integers and Unit’s digit!

PSA_PRACTICE_QNR6.PSA_PRACTICE_QNR6

Ans: Since, the product of ‘j’ and ‘n’ has the unit digit ‘9’, (j,n) must have unit’s digit as (3,3) or (1,9) or (9,1).

(3,3) is not possible as j,k,n are consecutive. If j ends in 3, k and n will have unit’s digit as 4 and 5 respectively.

(1,9) is also not possible as j,k,n are consecutive.If j ends in 1, k and n will have unit’s digit as 2 and 3 respectively.

(j,n) must have unit’s digit as 9,1. In this case, k’s unit place will have 0. Option (A)

(j,k,n) can be (9,10,11) or (19,20,21) and so on.

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