Number System Practice Test 2

Question : 21 of 40

Marks: +1, -0

Find the unit place digit in

(137)^61+(293)^17

Solution:

The unit place digit in

(137)^61

= (7)^61 = (7)^{15×4} × 7^1 = 7

.
The unit place digit in

(293)^17= (3)^17

= (3^{4×4}) × 3^1 = 3.

∴ The unit place = 7 + 3 = 0.

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