Question

What should come in place of the question mark (?) in the given series?

173 151 130 110 91 ?

• A. 64
• B. 78
• C. 73
• D. 56

Answer 1

Answer:

C. 73

Series: 173, 151, 130, 110, 91, ?

Differences നോക്കാം:

$173 - 151 = 22$

$151 - 130 = 21$

$130 - 110 = 20$

$110 - 91 = 19$
Pattern: subtracting 22, 21, 20, 19

Next step:

$91 - 18 = 73$

Final Answer:
$\boxed{73}$