Question : If a : b = c : d, then which of the following ratios is equal to a : c?

Option 1: a : d

Option 2: b : c

Option 3: a + d : b + c

Option 4: a + b : c + d

Question : If $a+b+c+d=4$, then find the value of $\frac{1}{(1-a)(1-b)(1-c)}+\frac{1}{(1-b)(1-c)(1-d)}+\frac{1}{(1-c)(1-d)(1-a)}+\frac{1}{(1-d)(1-a)(1-b)}$?

Option 1: 0

Option 2: 5

Option 3: 1

Option 4: 4

Question : Match the following:

A. Mohenjo-daro  1. Statue of a priest

B. Harappa     2. Port

C. Kalibangan   3. Plough marks

D. Lothal       4.The Great Bath

Option 1: A - 4, B - 1, C - 3, D - 2

Option 2: A - 3, B - 2, C - 4, D - 1

Option 3: A - 2, B - 3, C - 1, D - 4

Option 4: A - 1, B - 4, C - 2, D - 3