"ধনাত্মক সংখ্যা `a, b, c, d` AP-তে থাকুক। তারপর `abc, abd,acd,bcd` হয় (2001, 1M)

Let the positive numbers a,b,c,d be in AP. Then abc,abd,acd,bcd are (2001,1M) not in AP/GP/HP ( b ) in AP in GP (d) in HP

Let the positive numebrs a,b,c,d be in A.P. Then abc,abd,acd,bcd re (A) not in A.P., G.P., H.P. (B) in A.P. (C) in G.P. (D) in H.P.

The coefficient of a^(8)b^(4)c^(9)d^(9) in (abc+abd+acd+bcd)^(10) is 10! b.(10!)/(8!4!9!9!) c.2520 d.none of these

In a /_\ABC, tan\ A/2 = 5/6 and tan\ C/2 = 2/5 then (A) a,c,b are in A.P. (B) a,b,c are in A.P. (C) b,a,c are in A.P. (D) a,b,c are in G.P.

Let a,b,c,d and e be distinct positive numbers. If a,b,c and 1/c,1/d,1/e both are in A.P. And b,c,d are in G.P.then

Let a, b, c be distinct real number and D be the determinant given by D = |(a,1,1),(1,b,1),(1,1,c)| Statement1 : If D gt 0 " then " abc gt - 8 Statement - 2: A.M. gt G.M. .