Easy
1 point
ID: #27379
Question
a + b + c = 9, a^2 + b^2 + c^2 = 29 হলে ab + ba + ca = কত?
Options
1
26
Correct Answer
2
28
Correct Answer
3
20
Correct Answer
4
25
Correct Answer
Explanation
আমরা জানি, (a+b+c)^2 = a^2+b^2+c^2 + 2(ab+bc+ca)। বা, 9^2 = 29 + 2(ab+bc+ca)। বা, 81-29 = 2(ab+bc+ca)। বা, 52 = 2(ab+bc+ca)। বা, ab+bc+ca = 26।
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