The sum of the first three terms of an Arithmetic Progres...
The sum of the first three terms of an Arithmetic Progression (A.P) is 18. If the first term is 4, find their product
130
192
210
260
Correct answer is B
Sn=n2(2a+(n−1)d) ( for an arithmetic progression)
S3=18=32(2(4)+(3−1)d)
18=32(8+2d)
18=12+3d⟹3d=6
d=2
∴
Their product = 4 \times 6 \times 8 = 192
If f(x-1) = x^3 + 3x^2 + 4x - 5, find f(2)...
Which of the following is nor a measure of central tendency? ...
Given that P = \begin{pmatrix} 4 & 9 \end{pmatrix} and \(Q = \begin{pmatrix} -1 & -2 \\ ...
Simplify: (1 - \sin \theta)(1 + \sin \theta)...
Express r = (12, 210°) in the form a i + b j....
Given that g ; x \to 3x and f ; x \to cos x. Find the value of g^o f(20^o) ...
P, Q, R, S are points in a plane such that PQ = 8i - 5j, QR = 5i + 7j, RS = 7i + 3j and PS = x...
Evaluate \int_{0}^{2} (8x - 4x^{2}) \mathrm {d} x....
Consider the statements: x: Birds fly y: The sky is blue Which of the following statements ...