IIT-JEE Exam

Let a1, a2, a3,.... be in harmonic progression with a1 = 5 and a20 = 25. The least positive integer n for which an < 0 is
option
(A) 22
(B) 23
(C) 24
(D) 25

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IIT-JEE Other Question

Four fair dice D1, D2, D3 and D4 each having six faces numbered 1,2,3,4,5 and 6 are rolled simultaneously. The probability that D4 shows a number appearing on one of D1, D2 and D
G=1-SINX^3

Which of the following is true ?
(A) g is increasing on (1, )
(B) g is decreasing on (1, )
(C) g is increasing on (1, 2) and decreasing on (2, )
(D) g is decreasing on (1, 2) and increasing on (2, )