Number System Practice Test 2

Question : 34 of 40

Marks: +1, -0

4^61 + 4^62 + 4^63 + 4^64

is divisible by:

Solution:

4^61 + 4^62 + 4^63 + 4^64

= 4^61 (1 + 4 + 4^2 + 4^3)

= 4^61 (5 + 16 + 64)

= 4^61 × 85

= 4^60 × 340

Hence, it is divisible by 10.

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