Question 15

The missing number in the given series is:
15 (105) 14 , 13 (?) 12

The pattern followed is that the number in the middle is obtained by multiplying the other two numbers and dividing the result by 2.

Eg : $$\frac{15\times14}{2}=105$$

Similarly, $$\frac{13\times12}{2}=13\times6=78$$

=> Ans - (B)

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The missing number in the given series is:15 (105) 14 , 13 (?) 12