1.

X= { The units digit of the sum of 10 consective natural numbers } Find X.A. {5}B. {2}C. {3}D. {0}

Answer» Correct Answer - A
10 consecutive natural numbers will have their units digits as 0, 1, 2, 3, 4, 6, 7, 8, 9.
` therefore ` Units digits of their sum = 5 ltbr. `therefore ` X={5}`
Hence , the correct option is (a)


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