Question

if the 2nd and 5th term of a GP are -6 and 48 respectively,find the sum of the first four terms​

Answer 1

Answer:

45

Step-by-step explanation:

T2 = ar = 6

T5 = ar4 = 48

T5T2 = ar4ar = 486

= r3 = 8

⇒ r = 2

Sn = a((rn)−1)r−1

S4 = a((r4)−1)r−1

S4 = 3((24)−1)2−1

= 3(16 -1)

= 45

Answer 2

Answer:

45 is the correct answer