দুটি রোধ `R_1` এবং `R_2` ভিন্ন উপকরণ দিয়ে তৈরি। তাপমাত্রা সহগ

If R_1 and R_2 are two non-empty relations in a set A. Which of the following is not true? (1) If R_1 and R_2 are transitive, then R_1uuR_2 is transitive (2) If R_1 and R_2 are transitive, then R_1nnR_2 is transitive (3) If R_1 and R_2 are symmetric, then R_1uuR_2 is symmetric (4) If R_1 and R_2 are reflexive, then R_1nnR_2 is reflexive

Let f:[-1,2]->[0,oo) be a continuous function such that f(x)=f(1-x)fora l lx in [-1,2]dot Let R_1=int_(-1)^2xf(x)dx , and R_2 be the area of the region bounded by y=f(x),x=-1,x=2, and the x-axis . Then (a)R_1=2R_2 (b) R_1=3R_2 (c)2R_1 (d) 3R_1=R_2

If equivalent resistances of R _(1) and R _(2) in series and parallel be r _(1) and r _(2) respectively, then (R _(1))/( R _(2)) equals

Let A= {1, 2, 3, . . 20} . Let R_1 and R_2 two relation on A such that R_1 = {(a, b) : b is divisible by a} R_2 = {(a, b) : a is an integral multiple of b}. Then, number of elements in R_1 – R_2 is equal to ________.

Resistance of a milli ammeter is R_1 of an ammeter is R_2 of a voltmeter is R_3 and of a kilovoltmeter is R_4 . Find the correct order of R_1, R_2, R_3 and R_4 .