## Bharat Gupta is teaching live on Unacademy Plus

SEQUENCE AND SERIES Class -(9 (Geometric Proqression)

nth term of an Geometric Progression 2 a n-l Sum of n term of an Geometric Progression

Sum of infinite term of an Geometric Progression =

If r > 1 and x a . . oo r T z=c+-+-+-.. oo, then the value of V bc (a) ab (d) None of these If f(x) 2x +1, then the number of real values of x for which the three unequal numbers f(x), f(2x) and f(4x) are in G.P. is a.0 b.1 C. 2 d. none of these. If x, 2x 2, 3x +3, a. 27 are in G.P., then the fourth term is d. 13.5 b.-27 c. 13.5 The sum of three numbers in GP is 70. If the two extreme terms are multiplied by 4 and the middle term by 5, the resulting number are in A.P. Find the numbers. a. 10, 25, 35 b. 10, 20, 40 c. 15, 30, 35 d. 12, 24, 34

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If r> 1 and x -at+ g+.o y=b-r+1 2 + so, then the value of ab ac bc (d) None of these

If r > 1 and x=a+-+-2 + y=b-r+1 2 + oo, so, then the value of ab (a) A (b) aC (c) be (d) None of these N , 1-1 ab

If f(x) 2x + 1, then the number of real values of x for which t x), f(2x) and f(4x) are in G.P. is a. 0 he three unequal numbers f b. 1 c. 2 d. none of these.

If f(x) = 2x + 1, then the number of real values of x for which t x), f(2x) and f(4x) are in G.P. is a. 0 he three unequal numbers f b. 1 c. 2 d. none of these. 2 om)

If x, 2x + 2, 3x + 3, term is a. 27 are in G.P., then the fourth b. 27 c. 13.5 d. - 13.5

The sum of three numbers in GP is 70. If the two extreme terms are multiplied by 4 and the middle term by 5, the resulting number are in . . Find the numbers. a. 10, 25, 35 b. 10, 20, 40 c. 15, 30, 35 d. 12, 24, 34

The sum of three numbers in GP is 70. If the two extreme terms are multiplied by 4 and the middle term by 5, the resulting number are in A.P. Find the numbers. a. 10, 25, 35 b. 10, 20, 40 c. 15, 30, 35 d. 12, 24, 34 of alno 1 2.