CBSE Class 11-science Answered
1. (m+n)P2=56 & (m-n)P2 =12 FIND M AND N ... (WITH EXPLANATION )
Asked by Satyam sinha | 13 Feb, 2014, 09:05: PM
Expert Answer
P(m+n, 2) = (m+n)(m+n-1) = 56 = 8 * 7,
Thus, m+n = 8 ....(1)
and P(m-n, 2) = (m-n)(m-n-1) = 12 = 4 * 3,
Thus, m - n = 6 .....(2)
Adding (1) and (2), we get
Thus, m+n = 8 ....(1)
and P(m-n, 2) = (m-n)(m-n-1) = 12 = 4 * 3,
Thus, m - n = 6 .....(2)
Adding (1) and (2), we get
2m = 8+4 = 12
i.e. m = 6
From (1), n = 8 - m = 8 - 6 = 2
From (1), n = 8 - m = 8 - 6 = 2
Answered by | 14 Feb, 2014, 11:12: AM
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