In a G.P., the $3^{\text {rd}}$ term is 24 and the $6^{\text {th}}$ term is 192. What is its $10^{\text {th}}$ term? |
3972 3172 3252 3072 |
3072 |
Let the first term is a and the common ratio is r Then, ar2= 24 ........... (i) and ar5= 192 ........... (ii) Dividing (ii) by (i), we get ar5/ar2 = 192/24 r3 = 8 r = 2 Now, ar2 = 24 ⇒a × 22 = 24 ⇒a = 6 Thus the 10th term will be ar9 = 6×29 = 3072 |