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Consider the following sum:
•+1 • 1+ 2 • + • 3+ • 1 = 21 •
Q. In the above sum, • stands for
•+1 • 1+ 2 • + • 3+ • 1 = 21 •
Q. In the above sum, • stands for
- a)4
- b)5
- c)6
- d)8
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Consider the following sum:•+1 • 1+ 2 • + • 3+ &bu...
Given :
• + 1 • + 2 • + • 3 + • 1 = 21 •
Using base 10 system to solve this.
There are five terms to add. First, we write each term in the expanded form.
Tens place multiply by 10.
Let • be n
Replace • with n form equation
• + 1 • + 2 • + •3 + • 1 = 21 •
n + 1n + 2n + n3 + n1 = 21n
Expand each term using the base ten system.
n + 10 + n + 20 + n +10n + 3 + 10n + 1 = 210 + n
23n + 34 = 210 + n
22n = 176
n = 8
If • replace with 8 then we get the result.
Hence, the • (dot) stands for digit 8.
• + 1 • + 2 • + • 3 + • 1 = 21 •
Using base 10 system to solve this.
There are five terms to add. First, we write each term in the expanded form.
Tens place multiply by 10.
Let • be n
Replace • with n form equation
• + 1 • + 2 • + •3 + • 1 = 21 •
n + 1n + 2n + n3 + n1 = 21n
Expand each term using the base ten system.
n + 10 + n + 20 + n +10n + 3 + 10n + 1 = 210 + n
23n + 34 = 210 + n
22n = 176
n = 8
If • replace with 8 then we get the result.
Hence, the • (dot) stands for digit 8.
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