Direction : Solve the given series and answer the following questions. Series:…
2024
Direction : Solve the given series and answer the following questions.
Series: a + 15, a+ 16.2, a+18.6, _____, _______, M
Note: (i) x and y are prime number less than 10. (y>x)
(ii) xy = a
(iii) 2a = 10y.
If 7 is added to the value of 2a, then the resultant is?
- A.
Divisible by 7
- B.
Multiple of 11
- C.
Prime number
- D.
(a) & (b)
- E.
None of the these
Attempted by 3 students.
Show answer & explanation
Correct answer: D
From 2a = 10y and a = xy, we get 2xy = 10y, so x = 5. Since y is a prime greater than 5 and less than 10, y = 7 and a = 35. Then 2a + 7 = 77, which is divisible by 7 and is also a multiple of 11.