Reasoning • Series
Number Series - Arithmetic Progression
basic Level
Formula
Series: a, a+d, a+2d, a+3d... where d is common difference. nth term = a + (n-1)d
Explanation
Numbers increase or decrease by constant difference.
Example
2, 5, 8, 11... (d=3). 5th term = 2 + 4×3 = 14
Quick Trick & Mnemonic
QUICK TRICK: Find difference between consecutive terms. Check if constant. Use formula for nth term.