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ഒരു സമഗുണിത പ്രോഗ്രഷനിലെ ഏഴാം പദം 320, ഒന്നാംപദം 5 ആയാൽ പൊതുഗുണകം എത്ര ?

A2

B4

C6

D8

Answer:

A. 2

Read Explanation:

n ആം പദം = a × r^(n-1) ; a = 5, n = 7 ഏഴാം പദം=5 × r^(7-1) = 320 = 5 × r^6 = 320 ⇒ r^6 = 64 ⇒ r^6 = 2^6 ⇒ r = 2 പൊതുഗുണകം = 2


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