The last digit of (2171)7 + (2172)9 + (2173)11 + (2174)13 is  
  • a)
    2  
  • b)
    4
  • c)
    6
  • d)
Correct answer is option 'B'. Can you explain this answer?

GATE Question

By Pooja Yadav · 3 weeks ago ·GATE
S T answered 3 weeks ago
1+2+7+4=14

1^7=7

2^9=512

3^11 or3^3 have last digit 7

4^(even no) give 6 as last digit and
4^(odd)=4 as last digit

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