Elitmus Exam Numerical Ability Area and Volume

p be a no. in base N system whose all digits are 1. converting p in decimal we get z. the possible value of z is(are)?
a.21
b.12

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Elitmus Other Question

find the probability when y=x^4+4 is divisible by 5.
a.1/5
b. 2/5
c.1/9
d. 4/5
planting all these seeds ---- more hard than I thought.