Noontime Temperature | ||||||
Mon | Tue | Wed | Thu | Fri | Sat | Sun |
66 | 78 | 75 | 69 | 78 | 77 | 70 |
Let \( T_r \) be the \( r^{\text{th}} \) term of an A.P. If for some \( m \), \( T_m = \dfrac{1}{25} \), \( T_{25} = \dfrac{1}{20} \), and \( \displaystyle\sum_{r=1}^{25} T_r = 13 \), then \( 5m \displaystyle\sum_{r=m}^{2m} T_r \) is equal to: