Question

Assertion (A): a² + b² + c² = 66, ab − bc − ca = 17 ∴ a + b − c = ±10 

Reason (R): (a + b − c)² = a² + b² − c² + 2ab − 2bc − 2ca

Options

• Both A and R are true, and R is the correct reason for A.

• Both A and R are true, and R is the incorrect reason for A.

• A is true, but R is false.

• A is false, but R is true.

Answer 1

A is true, but R is false.