Correct Answer - Option 5 : None of the Above/ More than one of Above
GIVEN:
A number between 11 and 90 that is divisible by 7 are 14, 21, 28 .............84
FORMULA USED:
Last term(l) = a + (n - 1)d, where a = 1st term, n = Number of terms and d = Common difference(difference between two consecutive term)
CALCULATION:
All the numbers are in the Arithmetic series
⇒ a = 14, d = (14 - 7) = 7 and l = 84
⇒ Last term(l) = a + (n - 1)d
⇒ 84 = 14 + (n - 1)7
⇒ 84 - 14 = (n - 1)7
⇒ 70 = (n - 1)7
⇒ 10 = (n -1)
⇒ 10 + 1 = n
⇒ 11 = n
∴ There are total 11 numbers that is divisbile by 7 between 11 and 90
