Which of the following in an orthogonal matrix `[6//7 2//7-3//7 2//7 3//7 6//7 3//7-6//7 2//7]` b. `[6//7 2//7 3//7 2//7-3//7 6//7 3//7 6//7-2//7]` c. `[-6//7-2//7-3//7 2//7 3//7 6//7-3//7 6//7 2//7]` d. `[6//7-2//7 3//7 2//7 3//7-3//7-6//7 2//7 3//7]`

Which of the following is an orthogonal matrix ? ( ⎡ ⎢ ⎣ 6 / 7 2 / 7 − 3 / 7 2 / 7 3 / 7 6 / 7 3 / 7 − 6 / 7 2 / 7 ⎤ ⎥ ⎦ (b) ⎡ ⎢ ⎣ 6 / 7 2 / 7 3 / 7 2 / 7 − 3 / 7 6 / 7 3 / 7 6 / 7 − 2 / 7 ⎤ ⎥ ⎦ (c) ⎡ ⎢ ⎣ − 6 / 7 − 2 / 7 − 3 / 7 2 / 7 3 / 7 6 / 7 − 3 / 7 6 / 7 2 / 7 ⎤ ⎥ ⎦ (d) ⎡ ⎢ ⎣ 6 / 7 − 2 / 7 3 / 7 2 / 7 2 / 7 − 3 / 7 − 6 / 7 2 / 7 3 / 7 ⎤ ⎥ ⎦

Add the following fractions: 1/6+4/6 (ii) 2/7+3/7+4/7

Solve : 3 2/7+1/7-\ 2 3/7

The range of the following set of observations 2,3,5,9, 8, 7, 6, 5, 7, 4, 3 is

The direction cosines of the ray from (0,0,0) to (2,-3,6) are (A) -2/7,3/7,-6/7 (B) 2/7,37,6/7 (C) -2/7,-3/7,6/7 (D) 2/7,-3/7,6/

Median of the following numbers 4,4,5,7,6,7,7,12,3 is

Find the mode for the following series: 7.5, 7.3, 7.2, 7.2, 7.4, 7.7, 7.7, 7.5, 7.3, 7.2, 7.6, 7.2

Find the mode for the following series: 7.5, 7.3, 7.2, 7.2, 7.4, 7.7, 7.7, 7.5, 7.3, 7.2, 7.6, 7.2

Which is greaster : 2/7 of 3/4 or 3/5 of 5/8 (ii) 1/2 of 6/7 or 2/3 of 3/7

Express the following as improper fractions : (a) (7) 3/4 (b) (5) 6/7 (c) (2) 5/6 (d) (10) 3/5 (e) (9) 3/7 (f) (8) 9/4