Let 1 x_1 , 1 x_2 , 1 x_3 , , (x_i 0 for i = 1, 2, , n) be in A.P. such that x_1 = 4 and x_ 21 = 20. If n is...

Question

Let 1 x_1 , 1 x_2 , 1 x_3 , , (x_i 0 for i = 1, 2, , n) be in A.P. such that x_1 = 4 and x_ 21 = 20. If n is the least positive integer for which x_n > 50, then _ i=1 ^ n ( 1 x_i ) is equal to -

Accepted Answer

(C)

JEE Main 2018 Mathematics question

Solution