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Dinesh Kumar K

· started a discussion

· 1 Months ago

Error in question (Question:75585.0)

kindly ammend the question It'swritten 9 raise to 2 instead of 9 raise to 9

Question:
Unit digit of 12 + 22 + 33 + ...... 92 is
Options:
A) 1
B) 2
C) 3
D) 7
Solution:
Ans: (d) Unit digit of 12 = 1

22 = 4

33 = 7

44 = 6

55 =5

66 = 6

77 = 3

88 = 6

99 = 9

∴ Unit digit of 12 + 22 + ...... + 99 =1 + 4 + 7 + 6 + 5 + 6 + 3 + 6 + 9 = 7

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