JAMB - Mathematics (2024 - No. 22)
Find the 7\(^{th}\) term of the sequence -10, 50, -250 ...........
165250
156250
-156250
-165,250
คำอธิบาย
T\(_7\) = ar\(^{n-1}\) = ar\(^{6}\)
a = - 10, r = - 5
T\(_7\) = -10(-5)\(^{6}\)
T\(_7\) = - 10 x 15625 = - 156250