Assertion (A) : Sum of 1^st 5 terms of the G.P. : $\dfrac{2}{9}, \dfrac{1}{3}, \dfrac{1}{2}, ……. \text{ is } \dfrac{55}{72}$.

Reason (R) : If for a G.P., the first term is a, the common ratio is r and number of terms = n, then sum of first n terms S_n = $\dfrac{a(r^n - 1)}{r - 1}$ for all r.

1. A is true, R is false.

2. A is false, R is true.

3. Both A and R are true.

4. Both A and R are false.

Assertion (A) : Points (-5, 1) and (4, 1) are invariant points under reflection in the L. The line L is a line parallel to x-axis at a distance of 1 unit in the positive direction whose equation is x = 1.

Reason (R) : A point P is called an invariant point with respect to a given line L, if its image in the line L is the point P itself.

1. A is true, R is false.

2. A is false, R is true.

3. Both A and R are true.

4. Both A and R are false.

Assertion (A) : If (3a, 4) is the mid-point of the line segment joining points (-6, 5) and (-2, 3); then a = -4.

Reason (R) : The mid-point of the line segment joining the points (x₁, y₁) and (x₂, y₂) is $\Big(\dfrac{x$1+ x2}{2}, \dfrac{y1 + y2}{2}\Big).

1. A is true, R is false.

2. A is false, R is true.

3. Both A and R are true.

4. Both A and R are false.

Assertion (A) : Given two straight lines 3x - 2y = 5 and 2x + ky + 7 = 0 are perpendicular to each other when k = 3.

Reason (R) : Let AB and CD be two mutually perpendicular lines and their inclinations be α and θ respectively, then tan θ = -cot α.

1. A is true, R is false.

2. A is false, R is true.

3. Both A and R are true.

4. Both A and R are false.