Question

Pls solve this as fast as possible.

Answer 1

$tm =a + (m - 1)d = n \\ tn =a + (n - 1)d = m \\ m - n = (n - m)d \\ d = - 1 \\ a + 1 - m = n \\ a = t1 = m + n - 1 \\ \frac{t23 + t25}{2} = t24 = a + 23d = m + n - 1 - 23 = m + n - 24$

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I answered first

Answer 2

airthmetic mean of T23 and T 25

= ( T23 + T25 ) / 2

=( a + 22d + a + 24 d ) / 2


= 2a + 46 d / 2

= 2 ( a + 23 d ) / 2



= a + 23d = T24

arithmetic mean = T24




let m = 23 , n = 25 , and and p = 24

so the arthmetic mean of

m + n = p

m +n = 24

m + n - 24 = 0


option (b). is correct.