Discussion

Explanation:

Let’s look at the last digit of powers of 2.

2¹ = 2, 
2² = 4, 
2³ = 8, 
2⁴ = 16, 
2⁵ = 32, 
2⁶ = 64 
…

Thus, it can be seen that the unit’s digit of 2ⁿ is repeating after every 4 terms in the pattern of 2, 4, 8 and 6. 

In general, last digit of 2^4n+a will be same as the last digit of 2^a.

Hence, the last digit of 2⁵⁵ ≡ 2^4×13+3 ≡ 2³ = 8.

Hence, option (b).

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