Unit's digit in (784)126 + (784)127 is :
A. 0
B. 4
C. 6
D. 8
Answer: Option A
Solution(By Examveda Team)
Unit digit of 42 is 6So, unit digit in (42)63 is 6
∴ Unit digit of (784)126 = Unit digit in 4126, which is 6
Unit digit in 4127 = Unit digit in (4126 × 4) = Unit digit in (6 × 4), which is 4
∴ Unit digit in (784)127 is 4
Hence, unit digit of [(784)126 + (784)127] = Unit digit of (6 + 4) = Unit digit of 10, which is 0
Related Questions on Number System
Three numbers are in ratio 1 : 2 : 3 and HCF is 12. The numbers are:
A. 12, 24, 36
B. 11, 22, 33
C. 12, 24, 32
D. 5, 10, 15
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