1.

What is the unit digit of the sum of first 78 whole numbers?1). 32). 93). 84). 0

Answer»

Sum of first 78 WHOLE numbers = 0 + 1 + 2 + 3 + 4 ……………….76 + 77

⇒ 78/2 (0 + 77)

⇒ 3003

Unit digit of this sum will be 3.


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