Total term = 57
7th term = 13
last term = 108
45th term = ?
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Answer:
given
a+ 6d = 13.......eq1
an = 108
a+(n-1)d = 108
a+56d = 108.....eq2
solving eq 1 and 2 by elimination method
a+ 6d = 13
a+56d = 108
-. -. -
-50d = -95
d = 1.9
a + 6× 1.9 = 13
a= 13 - 14.4
a = -1.4
now
a45 = a + 44d
= -1.4 + 44× 1.9
solve it and get your answer
hope it helps
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