RRB Assistant Loco Pilot and Technician Model Paper 5 with solutions

Question : 15 of 100

Marks: +1, -0

If a and b are two odd positive integers, by which of the following integers is

(a^4 – b^4 )

always divisible ?

Solution:

(c)

a^4 – b^4

(a^2 + b^2 )

(a + b) (a – b)
∴ Required number = (3 + 1) ( 3 – 1) = 8

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